Sp14 preamp build

Sp14 preamp build. 00 (lbs) Calculate Shipping: Shipping Dimension: 24. The shield is designed to do the same thing. Audio Research SP14 preamplifier. It sounds nice , but since it was put together when it was turned on or off there w . Also Gateway laptop running JRiver. Very well balanced sound. Hoping for further improvement as I continue to listen. Interested in this item? Contact Edilita now! USAM I too wish Sachs preamp owners would chime in here. The SP14 preamp, which includes the film cap, precision resistor, and Mundorf Silver/Oil coupling cap upgrades as well as an upgraded case is about four months old, and has been trouble free. So fricking annoyed at this point. I've been trying to talk myself into doing a preamp since and finally bit The SP14 is a hybrid design, and follows in the tradition of the SP9 Mk. Both Bryston and ARC have very nice phono sections, so an outboard may be wasted. I realize that some of us prefer having no filters at all. Thanks Adam. This is a wonderful preamp with an AWESOME phono stage. ($399) With NOS tube rectifier and two NOS power tubes. Buy this pre-amp for yourself, build it yourself, or have Roy do it for you. SP13 preamp, fully assembled & tested, with remote control, $760. How is that SP14? Been eyeballin it some. Watch Report This Ad. But I can only located ones with mounting flanges attached - well attached, not easily removed. Below are the photos of my SP14 from Roy. 00in x 12. I have to turn the gain and volume all the was up to be able to hear it and it's just enough to hear it. Baby is coming soon so we need money and space. 1 system. Uses 6SN7 octal tubes, has dual mono regulated power supplies for each channel, for both B+ and filaments. What is the workflow process of requirements, work packages, and work items in Focused But 7 years ago the SP12 got a big brother, the SP14, and in the past 5 years or so the SP12 has almost been forgotten by buyers, as buyers were no longer looking for a "budget" tube preamp, but the very best tube preamp kit available, the With a price like that, no other preamp can touch the SP14 for value. 00in: Condition: My preamp Measures 2. Stay safe out there people. Here's some pics of the SP14 preamp this is our very best preamp, using larger 6SN7 octal tubes, in a larger 5" tall chassis. 00 (lbs) Calculate Shipping: Shipping Dimension: 25. I'll keep you posted. In a recent post I was asking if anyone knew of an affordable ($1200 or so) sonic step up from my ARC SP14 preamp since a threshold FET 9 I had recently aquired from a fellow Agoner did not, to my ears. Feel free to ask questions. You can build Have been looking around for a good tube preamp to build. I've had this preamp for ten years. I am using your phono stage, SP14 preamp, a pair of M130 monoblocks, and B&W 803 speakers. Specifically, according to the information at www. using Erhars Audio's Aikido board along with the power supply board. Last april I built my first ever electronic project an ST120 amp , and it has been working flawlessly and sounding great since . Edilita Rosenberg, TX United States [other With a price like that, no other preamp can touch the SP14 for value. Item #649362980. Go. (The phono board will not fit in the SP14 chassis; they make a special phono preamp in its own chassis) There's also a Tape Loop and two sets of Pre-Outs, handy for bi-amping or for a powered subwoofer. 3 Audio Research SP14, CD input frequency response, V/C set to unity gain (0. I plan to build a phono preamp next summer and will be following this thread. It’s basically Roy’s sp14 unit with few upgraded parts and in a nice wooden enclosure. I have a small inventory of tubes. The tubes4hifi pieces are all available as kits. 8K 1w R-FIL 1 1 ohm 1w (use jumper for 2nd) C11, This new preamp design takes all the best design blocks of our famous and highly reviewe VacuumTubeAudio SP13 line stage tube preamp Tube for sale. The 1st was the SP14 preamp. Asking Price: CAD $ 2000. If you don't use shielded cable, you twist the wires to reduce noise. I built the Tubes4HiFi version (SP14) and it's the best preamp I've ever had. Audio Research SP14 preamplifier | Stereophile. My opinion is that if you take that board and use really good parts, wire, and attenuators you get a preamp that will compete with anything I have ever heard at any price. The story is that i am tired and with empty pockets in the world of SS and speakers and i am in searching of some hope in the tube world. Daily. II in using one 6DJ8 dual-triode vacuum tube in an intermediate gain stage of the phono section. FOR SALE: Sp14 amplifier, same as Don Sachs preamplifier: Tube Preamplifiers: $2600. From the SP14 into 2 down-firing Rythmik Audio DS1200 subs. Allows to swap between the 12A*7 family of tubes for various factors of gain. "the Strength: Very transparent phono stage, all records comes to life. There are no deposits. You will hear for yourself what it is I am experiencing. Item #650030118. Details on this component is available on the VTA (Tubes4hifi) site. Will report back. Dedicated to the restoration and preservation of all Greetings, I am interested in buying a Tubes4hifi SP14. Eversolo DMP-A8 Streamer. I am the second owner. This is the 2nd kit I have ever built. 00 PeterW, first, your post is totally irrelevant, as those are 9 pin sockets, and we are talking about octal tubes. Info: Tubes4HiFi latest SP14 tube preamp Asking Price: USD $ 2100. Sep 17, 2022 #30 theflattire said: Re: SP14 Build question - Ground from volume by Pablo Mon May 31, 2021 7:26 pm It's been a few years since I assembled my SP14, but as I recall the two ground terminals on the master volume control get a jumper run between them, and the nearest edge ground point on the PCB gets connected to the jumpered terminal on the volume control. So I don't mind getting up to change the volume. I started my foray into tubes using an Onkyo SS amp, with a little dot as a preamp. VTA doesn't pay a Chief This preamp IS intended for those DIY builders who may have already experienced my SP12, or who want the best preamplifier kit available at any price. but I have found other designs that I prefer for value. com products General: The SP14 is a hybrid design, and follows in the tradition of the SP9 MKII in using one 6DJ8 dual-triode vacuum tube in an intermediate gain stage of the phono section. Their best phono preamp sells for $895 preassembled and for $650 in kit form. Reviews. Then I can complete the SP14 project. The shield is only connected at the RCA jack buss. but most of all, lets the buyer know the lab uses Takman resistors, which are the most musical resistor in current production, Although they employ the Rex/carbon, whereas I much prefer the Rey /Metal. Awhile ago I've put together 3 tone active tone control circuit that uses 1/2 of 12AU7 and both triodes of 12AX7. After researching, I found that the 6H8C was an equivalent tube. Music titles on vinyl CDs 78. J. It includes all the available upgrades; PRP and Takman resistors, Mundorf silver-oil output caps, all the Goldpoint attenuators, switches, knobs. Condition: 9 - Excellent (?) Date Posted: May 06, 18 11:26am (PST) Edited: May 14, 18 5:20pm. $500 I used 6L6's build guide. I ordered a quad of old Soviet era tubes from someone in Ukraine. I'm asking $1,095 for the preamp, plus shipping from 12186. I have built and sold over 40 custom preamps built around the sp-14 board. Plus I didn't want to add more And while checking these and my old pictures comparing this circut board to my first SP14 build when I didn't have anything to do , I noticed that I had soldered the TIP50's in wrong way around ! So it just goes to show check I found this forum while researching the SP14 preamp. 3 years ago, By an experienced builder. FOR SALE: Audio Research sp14 preamp: Tube Preamplifiers: $1850. tomlinmgt AK Subscriber. The Dynaco Tube Audio Forum. Look at the scaffold build/uses high quality trans. audiowize. This gives better separation between channels and For sale is my Vacuum Tube Audio SP14 preamp that I build 3 years ago. Replies 68 Views 8K. McIntosh MX113 (The Phono and Line preamp parts) (Sounds even better than its C26 preamp sibiling on contrast, with rich tone, deep bass, good 3D presentation, despite details a bit squashed in comparison with the AI M3A mentioned below) great build, best MC and MM section with gain, capacitance and load choices, great remote control. Needs to break in, but after about 4 hours, I am very pleased. Different types of the 12A's for I gave the ARC SP14 a good run which is a SS preamp with a tube phono section, and a fine preamp. After The 9 MkII, a hybrid preamp uses one tube in phono and one in line both being 6922/6DJ8 and other than cleaner it is missing some of that tube richness I enjoy in my system. VTA SP-14 preamp. I contacted the manufacturer and he said to return the amp and he will refund my $. I'm Don's is the line stage to drive my First Watt F4 and my pair of Rythmik F12 subs. I’m currently using a Vacuum Tube Audio SP14 tube pre in front of my SissySIT, and have used it with my M2C and M2x. I recall that the stock version was a little on the dry side for my tastes, but I didn't feel it was harsh. Dedicated to the restoration and preservation of all original Dynaco tube audio equipment - Customer support for Tubes4hifi VTA tube amp and preamp kits and all Dynakitparts. 2ndhandhifi. This gives better separation between channels The only reason I’m selling is to fund a custom-made tube preamp build. New build I need to start soon, between holiday get-togethers, shoppingetc not easy finding the time, but I'm sure I'll figure it out! Customer support for Tubes4hifi VTA tube amp and preamp kits and all Dynakitparts. soundbuff Active Member. For about $2200, you could easily afford their best preamp, the SP14 and the ST120 (60 wpc) power amp. it is fall, getting colder, time to break out the solder irons and build yourself the best darn tube preamplifier kit available (well yeah, I'm slightly biased) at least that's what 99% of my I emailed Don but he's doing a new thing now (no longer building these) and I did buy this preamp used. This update brings a host of new functionalities designed to enhance user experience and streamline implementation projects. IMHO My current ARC LS15 is a tube preamp that I am very impressed with. This preamp was built in 2020 and has one XLR input, three RCA inputs, and two RCA outputs (Miflex caps with Dueland Pure Silver bypass caps on output 1, Jantzen Caps on output 2). My Vacuum Tube Audio business is built around VALUE, not profits. Info: VTA Tubes4HiFi SP14 Tube Preamp Don Sachs clone (read) Asking Price: USD $ 650. Sep 8, 2020 #41 mkane said: Roys a real treat to work with and his products speak for themselves. Mar 18, 2021. edgobb. Audio-gd HE-1 MK2 Class A Preamp & Shunyata Research Zitron Cobra Power Cable. Hey, noticed I went over 2000 posts. Search . There will be tone by-pass switch. The only small issue I have is a little hum with the Sp14 gain controls maxed latest SP14 preamp build. » SP10 and PH6 Build - Questions » Rectifier in SP10/PH10? I built my first Aikido preamp shortly after Broskie’s original article and before he started offering boards and parts kits, so was point-to-point wired. Both the amps These 3 pieces were created by Rick Baker from Texas. Knowing how the circuit works and the role of each component allows for customization and fine-tuning of the guitar’s tone, helping players achieve their desired sound. The remainder of the system includes an Onkyo CD changer, Emotiva XDA-2 DAC/Preamp, Legacy Studio HDs (matched quad), NAD amp and REL T-3 sub in a 4. 00in: RIAA Preamp Build (Part 1) Well, someone asked me to design a low-noise stereo preamp for RIAA, (record phono input Equalization), so Challenge Accepted! I made a preliminary design effort using a Mu-Follower type layout for dead-quiet PSRR and low noise, and also chose a low-voltage tube. This unit was built by Bill Gratrix who has built 4 or 5 of these for himself and friends. 00: AB Feb 20, 2023: 2 : FOR SALE: Audio Research LS27 Preamp: Tube Preamplifiers: $4200. You cannot do it for $1500 though. In contrast to Roy's original design, Don puts the basic SP14 circuitry in a custom-made wood cabinet with the tubes side exposed on top for better cooling and access for those OFF - FOR SALE: Audio Research SP14 preamp Watch Report This Ad. I had already decided on the Sylvania Chrome Domes for one set of tubes, but didnt know what other tubes to run. Hybrid stereo preamplifier with phono stage. I have built over a dozen Transcendent Sound Ground Grid preamps. The power supply of the SP14 is a fully dual-mono design. Sep 17, 2022 #28 theflattire said: How is that SP14? Been eyeballin it some. Info: Custom Built VTA SP14 Tube Preamp. Here are three key features of SP14: 1. I now maintain a wait list for every product I build. Register; Login; Place an Ad Free for hobbyists! Hardware . It will run circles SP14 Preamp Listening Impressions Quite simply the finest preamp I have ever heard! Warning. Reply. View similar gear from other sellers on Reverb. The other that sells a. Our newest preamp, a real bargain, circuit design near identical to our SP14, giving 90% of the performance at about one half the cost, due to using a chinese chassis and a simplier power supply. SP14 Preamp Listening Impressions Quite simply the finest preamp I have ever heard! Warning. send email to ROY at: Quickly I landed on the VTA SP preamps, especially their top SP14 models at http://www. I've been meaning to write this for 3-4 years now, but just never got around to it. I need an advice from you regarding the acquisition of a cheap ( chinese ) tube preamp. My build currently: - Monitor Audio Silver 300 speakers - Project Debut Carbon Turntable - Marantz Cd5005 CD player They are hand made, custom built, dressed up versions of the VTA SP14 kit. I've built many of these units for VTA, and there are numerous Dynaco forum members that can vouch for my work. Unlike the LS units, the SP's have a built-in phono stage making the Also not to waste money on boutique parts where they don't count, but to use the right part in the right spot. I may throw in my 2 cents on these issues as this project moves along. OPTIONS-MSRP (US NEW RETAIL) $2,995. It is very solidly built. 0 - 2. More like $1800-$2200 depending on the case, cap and tube choices. III turntable with the Eminent Technology Model 2 tonearm and an AudioQuest 404i-L cartridge. The SP14 is also a SS pre. Yes it is a tubesforhifi SP14 that Don hotrods. Everybodys preamps punches above its price point. 99 Shipping. Does anyone know what the input impedence is for the SP14 preamp? I tried looking at the VTA site but when I click on the details link it stalls and times out without connecting to the page, so I thought I'd ask here. Looks like there is a lot of info about the SP14. INTRODUCED. Allan I just wanted you to know how much I appreciate this upgrade. SAP Knowledge Base Article - Preview. Info: Audio research SP14 Preamp-reduced. Mine was built with one output using 2 uF AudioCap Theta capacitors bypassed by teflon capacitors for my Pioneer M-22 which has an input impedance Up for sale my VTA SP14 Tube preamp with upgrades. (switching from Yamaha cx preamp) Built like a tank, it's amazing that a 25+ yr equipment still runs & looks new, solid So, I just put together the Tubes4Hifi PH16 phonopre. SOLD - FOR SALE: Custom Built VTA SP14 Tube Preamp . I've been obsessing for longer than I'm comfortable admitting to and I've narrowed it down to two possible builds: transcendence masterpiece vs. Info: Audio Research sp14 preamp Asking Price: CAD $ 1850. These may not create an interference, but thought I'd ask about simple format PCB 8 pin sockets preamp build preamplfier sp14 transcendence masterpiece tubes4hifi Prev. If I use the SP14 with a First Watt M2x which is only 25 watts the hum is barely I have built and sold over 40 custom preamps built around the sp-14 board. Doing it that way, you can use an octal input tube and noval follower tube, even one with an unusual basing. Silver faced, with selectable mono mode and adjustable gain. [From ARC marketing material] Revisions [ No data found ] Details. ) Fig. It uses 4 6SN7's. If you can afford an ARC preamp, you are probably going to be I have and use a SP14 with a VTA ST70 in my main system. Built (by the previous owner) in 2015 from a kit provided by Tubes4hif. $3000 would get you both fully assembled and tested. The see more. Payment method: Cash, Money Wire, Interac/EMT: Ships to: Canada, United After researching all the phono preamp kits out there I also concluded that the PH16 should be the best sounding. I’ve wanted to build one of these for a long time, and finally got the resources together to get a kit. This preamp IS intended for those who want a $6000 preamp but who can't afford that. The first is with the volume. Build is nice but can vary a little in execution from unit to unit. Retail Price: USD $2995. I mounted the caps on the bottom and installed the boards with the sockets flush to the top plate. Would you like to react to this message? Create an account in a few clicks or log in to continue. But having been made aware of the Psvane CV181 tubes I couldn't resist the temptation of trying them in my setup. I heard an ST-70 with a Curcio upgrade last night driving the same speaker I have and using a higly regarded preamp, and in my ears, there is no FOR SALE: Tubes4HiFi latest SP14 tube preamp Featured. Nice sounding preamp, but there wasn't a night and day difference between the DS and my BAT tube preamp. I think good enough things have been said here. Full Member; Posts: 916 » Gallery; Re: Best Tube Buffers After finishing my tube system, I thought some better cables would be the finishing touch. For example, I built Roy Mottram's VTA SP14 preamp. 2020-08-24 4:18 pm #22 2020-08-24 4:18 pm Here we have a custom pair of VTA M-125's driven by a custom built VTA SP14 preamp. The SP14 preamp, which includes the film cap, precision resistor, and For sale a SP14 preamp board octal partially assembled. Just a great sound. Anyway, just curious at this point. The ARC tube will be included as well. He has various preamp and power supply board kits along with complete kits. 00: Payment method: Paypal, Money Order: Shipping weight: 25. 4 Audio Research SP14, phono input frequency response, measured at Tape 1 outputs (0. Forum create on Forumotion FOR SALE: SP14 Preamp Watch Report This Ad. Not I built a Tubes4Hifi SP14 preamp with the Khozmo digital controller about a year ago. Payment method: Paypal, Money Order: Shipping weight: 35. Roy at VTA suggested just going with a pair in the driver stage, which made the But I’m waiting to hear from Grovegardner, who also built the SP14 (??) preamp. Share | Previous | Next. Thanks! Like Dislike. Grado Silver1 Cartridge. The SP14 is VTA's finest preamp. I used Mundorf caps, Mullard NOS 6922, and separate chassis for power supply and preamp to isolate from potential noise. Thank you for such detailed pictures and your accompanying comments! I will be building an SP14 this coming week and this is a very helpful thread, which I just now bookmarked for future reference. Asking Price: USD $ 1250. I listen to everything in my system and I know what I'm actually in the process of building the SP14 line-stage. 1989. It's a nice preamp. So, I kept the BAT preamp, bought a BAT power amp, and have gone fully balanced. Interested in this item? Contact Edilita VTA SP14 Khozmo new build hum. Plus I didn't want to add more Yes I am using this tube pre-amp. Very happy with the sound. Blu-Ray-Audio DVD 6. So 4 total. Thread starter hrudulv; Start date Jul 25, Vacuum Tube Audio SP14 Preamp Impressions. send email to ROY at: tubes 4 hifi. It is a cost no object design without all the ridiculous markup and hype of the high end industry. Issue 61 (Special Report) Issue 62 (Consideration) Vol. Member. My front end consists of the VPI HW19 Mk. You build the kit? This amplifier is freakin awesome! zackthedog AK Subscriber. com products I know I'm looking ahead but I am about to finish my ST-120 amp. SOLD - FOR SALE: Audio research SP14 Preamp-reduced . I couple months back I decided to build a Tubes4Hifi SP 20 preamp as a kit, which I soon learned was way beyond my skill set. My opinion is that if you take that board and use really good parts, wire, and attenuators you get a here are some photos to help you identify the parts to build the SP14 inquire about any other options or modifications you might want via email . NOTE: For phono use with this preamp, you'll need to add a separate phono preamp such as our premium PH14 or PH16 phono preamp below. About Seller: Follow user. But now, here it is. Maybe if the preamp is truly end-game and worth $5000 then this build has immense value, but I can't gather any of that information from this thread. I have the Clarity MR & FT-3 currently installed. While I'll start out mating it with a stock PAS-3 and Snell E-III speakers, I want to see what you guys recommend for a kit pre-amp since I had a ball putting the ST-120 together. tube4hifi SP14 Preamp Photo. Reactions: haisaikat and soundbuff. Documentation includes build sheet and all notes by the builder. View and Download Audio Research SP14 owner's manual online. 2020-08-24 4:11 pm #21 2020-08-24 4:11 pm #21 I'd love to see a photograph showing said connection denny9167. Brian Luckhurst Toronto, ON Canada [other classified ads] For sale is my Vacuum Tube Audio SP14 preamp that was built approx. Non remote. Pandora interconnect from TARA Labs carries LP information to the preamp. 00in x 18. I just used them in an Aikido preamp I built for a friend. Don Sachs is a Harman Kardon Citation valve amp guru and over the last half a dozen years or so has been building and putting his own spin on Roy's pre-amp design. Dynaco Repair, Restoration, & Modification Center. The VTA SP14 is in my wish list of pre amps to try in my system. This preamp uses 6SN7 tubes for buffer and gain stages along with a 6AX5GT rectifier tube. View similar gear. lawken Dealer\Reseller\Trader\Service Provider Number of posts: 1606 Age: 47 Location: KL Registration date : 2009-01-20 Character sheet Source(s): Amplification: Even if Don Sachs offered his version of the SP14 in a kit I would not try to build it myself. Sounds fantastic. Joined 2005. Don's preamp is a fully-developed iteration of Roy Mottram's of Tubes4Hifi SP14 preamp, which employs the same tube configuration, the development of which has been fully Audio Research SP14 Preamplifier Ser:89040019 www. Item #650025080. Current date/time is Tue Oct 22, 2024 8:54 am. complete Aikido preamp kit is Tubes4hifi. I have spent numerous hours experimenting with parts choices based on my many years of But 7 years ago the SP12 got a big brother, the SP14, and in the past 5 years or so the SP12 has almost been forgotten by buyers, as buyers were no longer looking for a "budget" tube preamp, but the very best tube preamp kit available, the I built an Aikido preamp. Item #649435214. Also consider Russian PIO, or the Audyn Copper capacitors. by Roy Mottram Mon Nov 04, 2013 10:07 pm. I already built the PH16 phono-stage and it sounds very good, especially for its reasonable price of $710, which includes shipping costs. Provides two outputs. Custom Fields in Solution Readiness Dashboard Don has now taken the great tube SP14 tube preamp design from Roy Mottram at "tubesf4hifi" and is selling these preamps with several upgrades and optionality for buyers. Constrained layer damping on inside bottom of chassis and behind front panel. I dug out the little dot and put it in its place while I worked on the SP14. 00: ON Mar 17, 2023: 3 : FOR SALE: Audio Research LS8 MK ll Tube Preamp use Four 6922: Preamplifiers: $1500. 00: Payment method: Cash, Paypal, Money Order: Condition: 7 - Good (?) Date Posted: Oct 12, 23 9:18am (PST) Edited: Oct 12, 23 1:45pm* Updated! About Seller: Follow user. 2010-04-03 3:56 pm #19 2010-04-03 3:56 pm Audio Research SP11 MK ll Tube Preamp with Full size Separte Power Supply Canuck Audio Mart CA$5,500 Oct 5, Audio Research Model SP14 Stereo Pre-Amplifier Gumtree ZA ZAR 23,000 Oct 9, 2024 US Audio Mart AUDIO RESEARCH Pre-Amps. Mundorf Silver 0il . 13 No. Requirements: Inputs for Tuner, CD, Aux. For you guys that have this pre you all will concur with what I said above, I am sure of that. right attenuator (red wire), master attenuator (shielded coax out), left attenuator (green wire) start with center terminals of master attenuator first, easier to wire the outside terminals afterwards inputs to right and left attenuators shown in next photo right and left outputs of TAPE-SOURCE switch (center terminals of switch) run to inputs of right and left Hi, I'm itching to build a tube preamp! No more room in the Bottlehead crack for mods, it's stuffed, and while tube rolling is a fun sport it just doesn't scratch the build itch. 00. 88 Right now I am using a Schitt Audio Saga passive preamp because I like the remote and dual outputs and six different inpute But I am considering moving it downstairs and replacing it with another VTA component, a sp14 preamp. I have been mixing and matching the ST120 amp driver tubes. Let us In conclusion, understanding the basics of a guitar preamp circuit is essential for anyone looking to build or modify their own guitar amplifier. This morning I tested with a borrowed iphono2 set to 47k w/ 36 DB of gain and the highs were present, but not crispy. I like the tubes enclosed. One uses a 1. He So Its been a year since I built the SP14 and have been enjoying it since . It works very well with all of them, but want to try Was in the market for Tube Pre-Amp DIY or Assembled (Around $2k) and ordered from Roy (tubes 4 hifi) SP14-V22 assembled. I’m also building a new one. I am a believer in premium power supplies and high parts quality. Emotiva XPS-1 Phono preamp. I will NOT share the details and I will NOT modify any preamp that I did not build. I had purchased from Roy his Phono Preamp PH16-X and V22 SP14 Pre-Amp installed The preamp is a Tubes4hifi SP14 which is a 6SN7 aikido design. It has dual mono khozmo remote control attenuators, two switchable inputs and two outputs of which one has the capability to insert capacitors to act as a high pass filter. I decided to build the preamp in an aluminum chassis with a lid on top. Warm So I am new to the tube world. It has a Gold Lion tube in the phono stage. TYPE. I checked the voltages and they are all what,they are suppose to be. I will be adding it to SP14 (tubes4hifi) line preamp based on Aikido circuit. 1; 2; 3; First Prev 3 of 3 Go to page. I have also tried a passive preamp, a Pass B1 buffer as well as a Bottlehead Quickie, none of which is close to the SP14 and I believe a SP10 is not far from there. It is audible with my ear up to the tweeter and the woofer but not loud enough to make a difference with the music as I can't hear it when I draw my ear away from the speaker. Instructions like SP14 Preamp Listening Impressions Quite simply the finest preamp I have ever heard! Warning. I just finished up with my build of the sp14 and I'm having 2 issues. Which tube preamp kit to build? Elekit TU-8500 VS Bottlehead Moreplay. Item #649954318. The only electrolyic capacitors are in the filtering for the regulated 6 volt DC filament supply for the tubes. Vacuum Tube Audio SP14 preamp vD 6-1-13 www. The vta sp14 is one of the better tube preamps I’ve heard. Classified: FOR SALE - Tubes4HiFi - SP14 Preamp asking for $895. Read many good things about it here and would make 1/2 of my system totally Analog tube. Fully tested and assembled, it will run you $1490. Browse all Hardware Ads; Browse categories; Dealer eShops; Software . This gives better separation between channels and lessens the load and Also, I no longer wish to build preamps with HT switches, so please don’t ask for that either. 2 volts. I'm pleased with the Belton 9 pin PCB mount sockets used in my ST-35 amp and thought I'd get the same in an 8 pin socket for a SP14 preamp build project. arcdb. The Ph16 is working great, too. You can tailor the gain to match your amp and use the master to control the volume. 99 + $79. . 00in x 10. Merch Rep the community and hobby you love so much. Very simple build. After chasing some hum in the preamp and phonopre I finally got them very quiet. For Sale my beloved SP14 PREAMP by Tubes4HiFi - Roy Mottran. Bought in 2018 but but never managed to finish completelly and now I am interested in other projects . There's a used VTA SP14 selling for $800 at the US Audiomart website. uk The SP14 phono stage has 46db of gain. I don't know how that stacks up to other preamp's but I think it is decent. Bluebook The right price. Stal. com SP14 PCB 1 power supply section D1-4 8 1N5822 D5- D6 4 UF4007 or HER108 D11-12 2 UF4007 or HER108 D13-14 4 UF4007 or HER108 SP14 WIRING DIAGRAM YELLOW GREY - NOT USED WHITE (drawn in black) AN-5T240 240 VAC 6 VAC x 2 BLUE GREEN BLUE GREEN AN-0209 9 VACx2 TO 6 FOR SALE: VTA Tubes4HiFi SP14 Tube Preamp Don Sachs clone (read) Watch Report This Ad. I was going to jump on Dan Willoughby's assembled SP14 Vacuum Tube Audio SP14 preamp kits But when I read about the upgrades that Dan offers for his version for barely more than $1K, it's seems like a no-brainer. SACD DVD-Audio 6. tubes4hifi. Additional Information: Jul 20, 24 8:33pm McIntosh C2600 preamp Mcintosh MC452 amp McIntosh MC275 VI tube amps (two) McIntosh MT5 Turntable McIntosh D1100 Dac/Preamp McIntosh LB200 Light Box Eversolo DMP-A8 Streamer Dynavector DV-20x2L moving coil cartridge VTA SP-14 preamp Thorens TD-316 TT Grado Silver1 Cartridge Emotiva XPS-1 Phono preamp Sennheiser HD-600 I've upgraded a stock SP14 for a friend and built one for myself. com/SP14. The design is actually by a guy called Roy Mottram owner of tubes4hifi based in Seattle. , Phono (preferably built in). They really aren't that hard to build. Was interested in the 12B4, but people out there saying the 6H30 or even the old venerable 6SN7 or 6N1p is better. This is what Roy does and it works a treat. 5dB/vertical div. Post n°1; latest SP14 preamp build. 00: ON Mar 26, 2023: 4 latest SP14 preamp build. Forums Home. SP14 amplifier pdf manual download. Joined 2007. Dac into an SP14 tube preamp. The current attenuators Roy sells sound great in my opinion & have a nice feel. Instructions like up for sale is the highly rated SP14 tube preamp by "Tubes4HiFi". The SP14 has more versatility though than the LS7 from the specs. Really, it sounds like his main Tubes 4 HiFi is also known as Vacuum Tube Audio Our best known product is the VTA ST70 PCB modification for the Dynaco ST-70 amplifier, that first appeared in a Glass Audio magazine article in 1989. co. SIGN UP Dedicated to the restoration and preservation of all original Dynaco tube audio equipment - Customer support for Tubes4hifi VTA tube amp and preamp kits and all Dynakitparts. Payment method: Paypal, Money Order: Ships to: United States Shipping Weight: 15. The originals will be included. SP9/SP14 flyer (Version Vacuum Tube Audio SP14 preamp vD 6-1-13 www. I’m a longtimesee more. Thanks for the help guys. Mine was built I know I'm looking ahead but I am about to finish my ST-120 amp. Roy Mottram ; This preamp is in excellent condition. These are getting some age on them now though. not at the pcb. He's set up the board for 12V filaments, but with a little creative wiring they work fine with 6 volts too. When I got my VTA SP14 preamp, I wanted to change out the tubes. This is a great preamp and is the same circuit used in the Don Sachs preamp. I then brought the SP8-SE to my big downstairs system and put it in place of the other BAT preamp that I have - a BAT VK30SE tube preamp which uses four 6H30DR tubes. Quad of Sylvania 6SN7GTA chrome top tri-plates and Sylvania VT-126b 6X5 rectifier tube. Having built many of these fine preamps, I wanted to share a grounding philosophy that has resulted in dead quiet units for me. 00in x 15. I would describe the sound as very open and clear with excellent frequency response on both I've been obsessing for longer than I'm comfortable admitting to and I've narrowed it down to two possible builds: transcendence masterpiece vs. inquire about any other options or modifications you might want via email . DEALER AD: Psvane Tube Reference Preamp T417: Tube Preamplifiers: $2500. With the FOR SALE: SP14 Preamp Watch Report This Ad. If you are using and older Dynaco PAS-2/3 preamp in your system the sound quality will definitely be better without the preamp in the audio chain. Any future preamp builds will be SP14s. The entire signal path now has only quality film capacitors. 00in: Condition: The preamp is based on the DIY SP14 preamp by Roy Mottram of "Tubes 4 HiFi" and "Vacuum Tube Audio" fame. This piece of gear has sold. sound quite as transparent and holographic as the SP14. I have the PS Audio Gain Cell DAC for sale also but very reluctant to really sell together with PS Audio Stellar S300. Thorens TD-316 TT. Yesterday I had problems with the SP14, and pulled it out of line. with a standard line input of 1v rms, Tube preamp using 6SN7 tubes. I am the original owner. 5uf capacitor, the other a 1. Subscriber. Payment method: Cash, Paypal, Money Order, Money Wire: Shipping weight: 27. But Holger sells them as well now. With NOS tube rectifier and two NOS power tubes. You build the kit? zackthedog AK Subscriber. Front panel has selector, volume, and power knobs. Just one tube in the phono section. The line section is all-FET, using a circuit similar to that in here are some photos to help you identify the parts to build the SP14. in the Audio Research SP14 preamp This unit provide with a piece of ECC 88 Sovtek Cryogenic tube Ultra low noise. Over the past 11 months, I’d work on it, get frustrated and come back to it a couple months later and here we Over time, there have been several postings about hum issues with the SP14 preamp, with many "no issue" experiences. You can see this build on Roy's tubes4hifi site under "NEW 2020 build photos #2". 47uf Outut Caps , Elna 24 step attenuator. I know he said once that he recommends putting carbon film caps on the grids and cathodes for all 6sn7s, but I haven't inspected it that closely to know. The stepped attenuator removes the preamp from the audio chain and some like the direct connection to the amp. I opened up my SP14 and checked for you. Not surprising I really like the idea of using equipment that I assembled myself, so I'm considering building the VTA SP14 preamp next to drive my ST70. This occurs when I use the SP14 with either a 200 or 400 watt solid state power amplifier driving 96 dB efficient speakers. tubes4hifi SP14. return to VTA home page. I’ve used this unit for 6 or 7 y ars first with a Krell KSA-80 and then with a pair of Manley Snappers. Gonna try setting the iphono to similar gain to the SP14 and see if it reproduces the crispiness I'm hearing. 0uf. At the time I sourced my own chassis and face plate. This would make it easy to adjust the cartridge loading, frequency response and gain jumpers on the preamp board. So Its been a year since I built the SP14 and have been enjoying it since . com products. That hum is audible at the listening position. it is fall, getting colder, time to break out the solder irons and build yourself the best darn tube preamplifier kit available (well yeah, I'm slightly biased) This preamp offers five sets of input jacks (the one marked 'Phono' is for a line level source, not a turntable cartridge. ) All other aspects of the SP14 seemed to be to specification, including gain structure, noise, and overload. Sp audio research phono sp11 stage jfet diyaudioSp9 preamplifier The audio research classic 30Audio research sp8 preamplifier circuit diagram (schematic) – richard. For reducing the gain, I'd suggest Broskie's three-way stereo stepped attenuator. Sp-6-6a-6b-6c-6d Totally gone through and tested US Audio Mart $1,700 13% Feb 8, 2024 Audio Research Sp14 Silver. Home Gallery Latest images Search It is a perfect match for my SP14. @scothurwitz I returned the DS preamp because it had suffered damage in transit and the wait in the queue was too long. com products Quite simply the finest preamp I have ever heard! Warning. 6 . I ordered the kit without the chassis, as I wanted to build my own - plus I wanted to try to save some $$$’s I’m getting a LOT of noise out of this All the voltages are as they should be. I liked the sound it produced so much, that I went on to build my ST-120 stereo, and SP14 preamp. I also have a Bendix 5852 aka 6X5GT,bought it specifically for SP14. Click to expand DITTO!! I’ll never forget the night I was listening to my recently completed I have built and sold over 40 custom preamps built around the sp-14 board. I'm looking for some guidance. rear of front panel showing right, master, and left attenuator wiring front rear side, bottom right is ground on each attenuator where shields are connected closeup of front panel power switch wiring and suppressor capacitor red wire on selector is RIGHT output, green wire on selector is LEFT output, both to bottom terminals of TAPE-SOURCE All, I'm selling my personal Vacuum Tube Audio SP14 line stage preamp in a custom case. This new preamp design takes all the best design blocks of our famous and highly reviewe ×. However it was one delay after another, to where the original 6 weeks turned into 6 months and I was still waiting for him to start. Yes, my Vacuum Tube Audio SP14 is a $5000 preamp that I sell for much less! Here I'm going to tell you how that's possible and why it's such a great bargain (if you didn't already know). SP14 preamp this is our very best preamp, using larger 6SN7 octal tubes, in a larger 5" tall chassis. 00: CA Jun 15, 2020: 30 : DEALER AD: Cayin SC-10 Tube PreAmplifier PreAmp 2A3 6SN7 6SL7 300B 6922 5AR4: Tube Preamplifiers: $2799. Condition 8/10 Asking RM5900 COD KL Pls WhatsApp 0123308998. Thread starter luvrockin; Start date 2019-02-16 4:23 pm; Prev. . Flawless in both cosmetics and operation. DVD-Audio Blu-Ray-Audio 0. Joined Dec 26, 2015 Messages 266 Points 43 DIY'ed the 4S by Matt Renaud. I will continue to produce tube equipment. Then One lingering question; did DS also build the VTA-SP14 preamp before making his own brand? I'm still getting the relationship between the VTA and DS units. Design & Build Parts Electronic Design Equipment & Tools Construction Tips Software Tools Build Guides. This preamp built as a kit will total under $1000, or I can supply it custom built and ready to use. I never experienced any harshness, quite the contrary, but my speakers are nowhere near that sensitive. The Left and Right gain knobs are bypassed, I found the sound is better like this. In that vein, it is my turn to return the favor, and post some photos and comments regarding my own humble experience building the SP14. Amplifiers Solid State; Pass Labs; Tubes/Valves; Chip Amps; Class D; Power Supplies; Headphone Systems; Source & Line Analogue Source; Analog Line Level; Digital Source; » Latest SP14 Build » latest SP14 preamp build » latest edition of my version of the ST120 » 2015 SP14 build photos & info » SP14 looking for some help. The assembled list price is $1,635 for the preamp, a bargain at that. Their top line line stage preamp, the SP14 sells for $1350 preassembled and for $960 in kit form. I find the FT-3 having better detail. takes about 3 weeks from order to ship date for full kit or full assembled the new SP13 is an incredible bargain, I emailed Don but he's doing a new thing now (no longer building these) and I did buy this preamp used. cci1492 enjoy your journey. com SP14 PCB 1 power supply section D1-4 8 1N5822 D5- D6 4 UF4007 or HER108 D11-12 2 UF4007 or HER108 D13-14 4 UF4007 or HER108 R11–12 2 100 ohm 1w R20 2 120 R21 2 470 R22 2 1. Last Edit: Jul 29, 2018 10:26:08 GMT -5 by dasanto2 Well I did have a Schiit Saga preamp right before this one that had a remote and that made it convenient but I have to say, there is no comparison between the two. ws: I built the chassis myself using a bamboo top, walnut sides, Corian front and aluminum back plate. I get a great deal of enjoyment poring over photos and descriptions of other peoples' builds. com Check Details Audio-research sp9 preamplifier service manual download, schematics. Indepedant regulated filaments on separate transformer windings per channel. 00 (lbs) Calculate Shipping: For sale is my Vacuum Tube Audio SP14 preamp that was built approx. Very,very nice, yes, but not a step up. Every time. The Tape switch on the front left isn´t connected, I never had a tape any thoughts on a VTA sp14 for about $1,000 or a shiit freya preamp for $700? I would be using it with a hafler 500 that has been restored with new cap Audiogon The world's largest high-end audio community. send us email at: info@tubes4hifi. I first discovered the SP14 when looking at Roy’s site for parts to restore a vintage Dynaco preamp for a customer. Post n°11; Finishing Stage Board, PS Board and Starting Chassis. 00: "LATEST: I have decided to close the build queue. edgobb Posts: 71 Join date: 2010-11-09 Location: Texas. Better definition, seperation and much better response, especially in the lower Having built the SP14 preamp I would highly recommend the Russian Teflon FT-3 if you have the room. If you're gonna build a preamp, it's more important to separate the power supply. I'm guessing the crispiness I'm hearing is overload distortion. I have seen a few positive reviews of A new SP14 preamp . Used – Mint. Dedicated to the restoration and preservation of all SP14 preamp 51 build photos . It is a fantastic sounding preamp. 5K 1/4w R23 2 330K 1/4w R24 2 300K 1w R25 2 100K R30 1 6. Originally $2,395, now $1,895 ($500 savings) $2,395 Original price. I’m a longtime Audiogon member. It's a better preamp than the other two and it has more connection options. Thanks for your very fine equiipment. Item #649771703. The SP14 is the king. I've decided to listen to records instead of fretting over a little hum. I paid in my opinion a lot of money for this thing including extras for upgraded parts. The only electrolyic capacitors are in the filtering for the regulated 6 volt DC filament The preamp is based on the DIY SP14 preamp by Roy Mottram of "Tubes 4 HiFi" and "Vacuum Tube Audio" fame. My understanding is you need two wires to transmit a signal. These observations are implicit in Roy's instructions, but, made explicit, may help those with issues. Tubes4hifi also provides excellent support for builders. My system is the Tubes4Hifi SP14 preamp, VTA ST120 amp, and PH16 phonopre. Rear panel has four pairs of inputs, two pairs of outputs. This is a $6000 tube preamp with it's remote I used an ARC SP14 with a Bryston 3B for a few years. My SP14 Pre performed quite admirably with the supplied Tungsol 6SN7GTB tubes (top pic), yielding a slighly warmer sound signature than the Carver Pre I had been using. The SP14 is sort of the culmination of everything I have learned from rebuilding hundreds of vintage amps and listening to different parts choices in different spots in the circuit. htm, which looked to have everything I wanted - including a I've upgraded a stock SP14 for a friend and built one for myself. If you own an SP14 kit or any other version of this preamp, please DO NOT JUST PLUG A 6BY5 TUBE INTO YOUR PREAMP AS YOU WILL DAMAGE IT AND IT WILL NOT WORK! This modification is something I developed for my customers only. Independant maida style regulated B+ at a 265vdc (according to the schematic) per channel but these run off a single 6X5GT rectifier before splitting to the separate B+ supplies. I purchased new feet from ARC. Forums. I've been using the Conrad-Johnson PV9 as my reference, and was also fortunate to be able to borrow a Classé Audio DR-6. It was sealed in a original box,I opened it, powered to see if it works and it did. And while checking these and my old pictures comparing this circut board to my first SP14 build when I didn't have anything to do , I noticed that I had soldered the TIP50's in wrong way around ! So it just goes to show check and recheck then check again. Thanks for planning to build the Aikido to drive your F4s! And the 6sn7 is often the driver of choice among the most accomplished tube amp designers like Dick Olsher, Lynn Olson, Gary Dahl, et al, though their preamp designs are no doubt very advanced and parts Sidebar 2: System. My PH-16 with separate PSU and phono preamp I have begun listening to my nearly finished PH-16 Phono Preamp. Vinyl 126. onanysunday; Jul 3, 2020; Tube Audio; 2 3 4. This model has been a popular and durable design and this is a good clean example. Payment method: Paypal: Shipping weight: 20. It came out great and sounds fantastic. Home. Looks like your M caps are output #1 and your PIO are on output #2. second, I'm pretty sure you don't have an SP14 (because I've seen you answer about 100 other posts about products or parts you don't have), This is partially a result of me planning out an SP14 build and realizing how separate the volume and attenuation really is from the active tube section. This is not an unbiased review! I have started building my version of Roy Mottram’s SP14 preamp for sale because I was so impressed by the first one I built. Then again, I upgraded nearly everything in both builds. johnnycamp5 New Member. That bloom goes well with the cleanliness of the ss power amp and this is how I generally like to use tubes, in the preamp where tube replacement is infrequent vs. R. 3314749-First steps to work with Focused Build. The inner caps are for output #1 and the outer caps are for output #2. Info: Audio Research SP14 preamp Asking Price: USD $ 1250. com tubes 4 hifi "the path of least resistance is through a vacuum" With over 40 years in aviation, audio and microwave electronics this component has been constructed to realize the full potential of the exceptional VTA SP14 preamp board, audiophile components and best possible construction techniques. I got to build my second kit, and it worked. 1; 2; First Prev 2 of 2 Go to page. Since I built it I’ve been battling a slight hum and buzz. So you need to have anything over 10 years old serviced IME. Here is a link to Roy’s SP14 page: This is essentially a $3000-$4000+ commercial preamp built for $1600-$1900. And out to the wonderful BMR bookshelf speakers. A much larger PCB, with NO room to add a phono section inside. My system is a Tubes4Hifi SP14 preamp, PH16 phonepre, and ST120 amp. i All preamp builds use the all film cap power supply. Very tiny bit of hum in any component. I have owned the SP14, and it is a very nice preamp, however I prefer my current LS15 tube linestage. OFF - FOR SALE: Audio Research SP14 preamp . Roy Mottram ; Roy Mottram Admin Posts: 1839 Join date: 2008-11-30. I recall seeing zero negative opinions on his preamp build and was quite looking forward to it. SP14 preamp 62 build photos . I really liked the phono stage in my SP14 and since I have had line stages and other full function ARC preamps run through my hands and across my bench. Search titles only By: Search Advanced search Search titles only By: Search Advanced Forums. Audio Research Sp-14 hybrid stereo preamplifier w tube phono input, six line level FET inputs and two tape loops. Edilita Rosenberg, TX United States [other Excellent looking build. It is an excellent preamp in its own right, however I have concluded that no matter what you do to the GG it is bettered by the SP14. I had it tested in two position: in preamp input and preamp The LS7 is a tube preamp, while the SP14 is a hybrid, with just the phono stage tube driven. The preamp utilizes 6SN7 octal tubes, considered by many to be the most linear audio tube ever designed, in a unique circuit that inherently cancels distortion and power supply noise, without using feedback. I dont know how you wired your preamp, so you could have them wired opposite that. The Don Sachs preamp will run you about $2500. I believe Roy and Don are friends. You can purchase any of our products here from these web pages, making payment with a credit card through PayPal, or sending us a money order. Info: SP14 Preamp Asking Price: USD $ 750. by edgobb Tue Feb A point to be aware of is that as with many ARC preamps and line stages, the LS15 and SP14 have output impedance characteristics that may make them unsuitable for use with some solid state power amps having lowish input impedances. New cost is $1885. Ad Description. Previously, with the the left and right knobs maxedit was around 10:00-11:00 Great, I'm glad it's sounding good! It needed For your consideration, a Vacuum Tube Audio (tubes4hifi) preamp built by Roy Mottram. ray bronk. » VTA PH16X Build Thread (With SP14 to Follow) » Noobie re-building an ST-70 » Building a Phono preamp Sierra is correct. Newly built with tested and fully functional mother board which I bought from tubes4hifi. Anyway, after getting the kit assembled, I had issues with the voltage not meeting the specs and in my uninformed effort to fix it accidently fried the high voltage regulation section on both channels and fried a resistor or two on the left The PR-101 assembly manual also provided a layout. I'm waiting for the enclosure for the SP14, which should be here by Friday or Saturday. All quality parts have been used throughout. The SP14 is hands down better and even though it cost more than 3x as much, it was well worth it. Virtual Systems Let the world see what you've built. The line section is all-FET, using a circuit similar to that in the SP15. This one is housed in an "AudioNote" chassis. Good luck with your search, Jim . CD SACDs 8. I built a VTA SP14 preamp which generates a 55dB 120 Hz hum a few inches from the woofers. Item #649959345. Marketing material. Dynavector DV-20x2L moving coil cartridge. Call me with any questions at 970-846-0725. They work fine, preamp sounds great. Retail Price: USD $1500. You can check the below pre also super performance SP14 preamp . They sell everything both in kit form and preassembled. I don't have the experience and probably not the skill to do so. Nice clean orderly build. Where to find information on Focused Build setup/usage Focused Build Methodology Expected workflows for Focused Build for SAP Solution Manager Requirement-to-Deploy (R2D) sce. DVD movies This is a brand new, just assembled and tested Vacuum Tube Audio SP14 preamp. And into M-125 tube monoblocks. Enjoy your preamp!-Jeff Also, I no longer wish to build preamps with HT switches, so please don’t ask for that either. Sorry if I'm here are some photos to help you identify the parts to build the SP14. The stock electrolytics might take a while to SP14 preamp this is our very best preamp, a 4 tube line stage only preamp, includes tube power supply, the best preamp I've ever built !! Same essential circuit design as our SP12 but with many improvements. Jump to Latest A. The preamp is based on the SP14 board from Roy Mottram. Ray Bronk . Using tri-amped Magnapans I was concerned about losing the speed of the Aurum and the SP14. Hi everyone new to the site. Forgot to mention they come with a 2 year warranty and 90 days on the tubes. SP9/SP14 flyer (Version Well I did have a Schiit Saga preamp right before this one that had a remote and that made it convenient but I have to say, there is no comparison between the two. edilita for more feedback. Symptom. There are three 12AT7 type tubes with the center V1 tube I'm told having the most impact on the sound. Like Dislike. With tubes seen from holes. I rotate some of this gear: amplifier: SS: Sansui au-9900, Sansui AU-x701, Sansui 1000x, Sansui AU-505 Fig. Virtual Systems Let I forgot to mention with the left and right attenuators turned down a bit (1/4 turn) the sweet spot for listening with the main volume knob seems to be at around 2:00. I have listened for a bit and I love the sound I am getting from this preamp, I am so loving the transparency and separation of the instruments with the Frenzel. What I got is what most in the know call the newer ARC tube sound which is fast SOLD - FOR SALE: Audio Research sp14 preamp Watch Report This Ad. Vacuum Tube Audio SP14 PCB KIT parts identification photos photos in same order (mostly) as parts list our premium grade SP14 preamp SP14 preamp page . Their SP14 preamp is the equal of any $5k preamp you'll find on Audiogon. It will run circles The only negative thing is unlike what Audiobill said about his SP14 build being absolutely silent, there is a very slight static buzz on mine. I will be using either 6922s or a 6GM8. Joined 2005 . Using the PR-101 assembly manual as a guide, I would need a few more parts: But I can live with it right now and have no regrets. S. Price $1,399. 00 (lbs) Calculate Shipping: Shipping Dimension: 22. These 3 pieces were created by Rick Baker from Texas. Placed ordered 11/16/21 and delivered 11/27/21. We are excited to announce the release of Support Package 14 (SP14) for Focused Build in SAP Solution Manager. FYI - the pre amp (sp14) that they sell and recommend for this amp “. Happy as a pig-in-shit. Price 125 Euro + postage. 00: CA Aug 14, 2020: 31 : FOR SALE: Bellari VP130 tube phono preamp with new Ruby 12AX7 tube: Phono Preamplifiers: $100. Tubes have less than 100 Finished this up earlier this week and have been enjoying it since! I made a few mechanical modifications to Roy's kit, but the board is stuffed with stock p up for sale is the highly rated SP14 tube preamp by "Tubes4HiFi". Each channel has its own B+ and its own filament supply. The base SP14 kit will run you $1090. Logged Rusty Jefferson. Forum The conversation begins and ends here. lljkrm ajsh pkfuxc irysfmh powwl sntj apstcu arulplq uatjs bxkyc