Fortunately the XONO is among them. They are intended to fuel that interest. Sooner or later everyone gets a reply, sometimes the one desired. Constructed in the dorm library over Christmas break, the result was dubbed The Claw, a straight exponential horn 9 feet long with a 42 Hz expansion curve and a 50 sq ft mouth. 125" aluminum plate. The build experience was tons of fun. Lately they have kindly printed projects that I had already posted on the web, but I decided that they deserve a Mar 21, 2013 · PassDiy by Nelson Pass. I found this PCB for a "Pass 2. Pass Aleph P 1. Jul 12, 2013 · The P1. Mar 21, 2013 · After 22 years, it appears that quite a few DIY enthusiasts are still eyeing the A40 Class A amplifier design, but are discovering that not a single transistor from this design is still available. Replies 7K The BA-3 as preamp build guide. At least 10 db more. 2021 DIY ACA mini. The PCB has provisions for up to 6 relays for input signal switching and an output relay for delayed start-up muti Jul 15, 2021 · I built Electra-Print's passive preamp using a pair of their PVA-2n audio transformers, following their circuit design, but with two switchable inputs and no subwoofer output: Electra-Print. 2018 The Venerable Triode. I decided on the Nelson Pass Pearl 2 (www. Jun 6, 2017 · The gain stage of the preamp is a single Mosfet operated common source and biased by a Mosfet constant current source. I also have the Dantimax volume and input selection kits (these still need assembling) and the cases. The one loaned to me from a long time friend of the forum. It boasts symmetrical Salas shunt voltage regulators that use LED strings for very accurate voltage reference. com PVA Passive Audio Pre-Amplifier You Can DIY! Passive Preamp: Transformer Implemented | audioXpress I used a Galaxy 1U 124mm x 170mm Alu case from Aug 31, 2013 · Aleph J illustrated build guide post 777 - interesting note about skipping input capacitor if you are using a capacitor coupled preamp. john-china from diyaudio. Audio Amateur has published a number of projects modifying popular kits, usually Dynaco's. DIY NUTUBE PREAMP Revised 2020-07-25. The F-5 Turbo is a Push-Pull, Class-A power amplifier. All components that came with the kit were well within spec. Snail mail is Pass Labs, PO Box 219, Foresthill CA 95631. Mar 21, 2013 · B1 Buffer Preamp — 2 Participants. 5 X 3 inches and holds the circuitry shown in Figure 3. 2. If you build the balanced Zen preamp and plan to use it with a Zen poweramp, make sure to have a switch to vary the preamp's gain (I used a 6-position, 2-pole switch with discreet metal film resistors), as a Zen poweramp will need about 20 dB more gain than a typical poweramp. com . You cans see the result sitting between the Vincent CD player and DacMagicPlus D/A converter, in the next photo. 5 volts input to drive it to full output. Joined 2001. General Inquiries: Korg Nutube B1. Nov 7, 2002 · Hello all, I am about to begin construction of an Aleph 5. Pass to share me (us) so nice preamp circuit. I'm having a blast, though. com and you can also download the Gerber files to get your own made. The best way to reach me is by e-mail through the Pass Labs website, www. This pretty well finishes the preamp offerings in the Zen series. This little unit sounds remarkably well. VAT (US $1,331). Mar 21, 2013 · Here is the long awaited sequel to the Pearl phono stage, named after my maternal Grandmother who was good with a sling shot , played piano and organ and occasionally listened to my early Hi-fi efforts if the smoke wasn't too bad. Of course it needs the addition of the bias for the electret, but that is easy to implement . And yet there are guys out there who don’t care for the result. Mar 21, 2013 · Simultaneously, I fed the output of the amplifier into a spectrum analyzer which peak detected the spectrum from 0-100kHz. Colburn had worked with Pass at Threshold—he had answered an ad in Audio Amateur magazine for a "wizard's assistant"—and rejoined him at Pass Labs in 1994. “American Pass Labs (hereinafter referred to as Pass) is a long-established classic brand, and its product update cycle is also relatively long. The philosophy of the Zen amplifiers is based on the premise that B1 Buffer Preamp — Nelson Pass / 2008. Jul 15, 2021 · A few years ago I built a Pass-design buffer preamp based on matched pairs of JFET's which performed better than my £1200 Classe Audio preamp from 1991. I found it in one of the articles published on E. Jul 4, 2016 · In 2008, Nelson Pass submitted an article on its new F5 power amplifier design to audioXpress. Build instructions are perfectly clear. com Dec 6, 2019 · Folks, I assembled the Pass DIY class A kit, building two units each used in balanced mode. It is a DIY design by the famous designer, Nelson Pass, meant to be starter amplifier for people new to audio electronics to build. It seems to be OK. I'd really like to build a Pass designed preamp but require balanced inputs and outputs. As built has 55dB of gain with 47K input impedance for MM carts, can convert to MC by adding a single 100ohm resistor per board. Thus, the front left and right audio channels pass unprocessed to the stereo amp. Feb 21, 2005 · #1. Mar 21, 2013 · The point of a preamp circuit here is to function as a gain circuit with a high input impedance, a low output impedance, and a volume control. in china this is impossible , chinese hifi master always keep secret in heart ,never say one word. This privacy statement describes how PassDIY collects and uses the personal information you provide on our Web site: passdiy. Everything looked good. 2019 Leaving Class A 2019 redux. The following information is for those scouting out substitute parts: The Lambda output devices are no… Mar 21, 2013 · Nelson Pass Introduction. Apr 18, 2011 · I've constructed a version of the Koren PAS preamp (2001 version)in a brand new (not PAS) chassis. Have you looked at the Shiit Loki's? They are active tone control systems with a bypass switch. Aleph J illustrated build guide post 844 through 846 - regarding which way to mount the ZTX devices from the kit on the circuit board. It smashes atoms. Jul 19, 2023 · The preamp includes front panel switching as follows: Volume (using an Alps quad pot), Input selector (labelled Tuner, DAC, Phono and Tape), Mode selector (with positions for Stereo, Left only, Right only, Reverse), and a Meter Gain switch with settings of +10, +5, 0 and -4dB (the latter for studio level reel to reel tape decks). Feb 23, 2019 · The new DIY preamp designed during pandemic I needed a preamp with several single ended and balanced inputs, so it was a challenge during this strange pandemic times to design and make a new audio toy that would satisfy my needs. The design addresses the audiophile's enthusiasm for singleended amplification, but is even more interesting for its exploration of the performance available at the extremes of simplicity, having only a single gain device. This method gets a reliable, if short, response. 0" preamp on eBay. Resistors are the standard Vishay Dale RN55D from Pass's instructions, C100, 101, 200 & 201 are Dayton 1% metalized polypropylene. The low frequency rolloff introduced by C102+R31, is at an uncharacteristically high frequency. Re: Pass DIY B1 Buffer Preamp « Reply #27 on: February 26, 2013, 06:07:14 PM » I made a point to point wired version on perf board a couple of years ago, but never got around to putting it in a box. The suggested F5 circuit produces approx 15. 6L6; 2014-06-21 10:53 pm; 151 152 Nelson Pass, the mastermind behind the XONO is very DIY-friendly and often releases circuits to the DIY community. Part one described the Zen amplifier, a 10 watt single-ended…. Single-Ended Class A amplifiers have certainly hit it big in the four years since we began testing the first Aleph 0. I haven't heard one in person, but my first DIY amp in 1979 was a Pass design featured in Audio Amateur magazine. 00 USD . It measures about 6. I'm not sure whether to make an Aleph P1. " If you are unfamiliar with First Watt's product spectrum and with Searching the web I came across your site and was immediatley hooked. Nov 6, 2016 · A couple of years late on this, but whatever. Also thanks to Hans Buhl Houmoller, Bjarne Nedergaard, Brian Sorup and Ilias Kamouzis. 7 PCB's were assembled some years ago. The implementation of it in this circuit is really interesting. Sep 24, 2022 · An integrated amp or a preamp with HT bypass and a power amp; The center, surround, and/or height speakers will be powered by the AV receiver while an integrated or power amp powers the front left, and right speakers. This is another version from previous one where I used SSP at the input to accept selected source and drive LSA within PASS B1 where B1 driving output power amp. Jul 12, 2013 · Featured Vendors The diyAudio Store Parts Connexion miniDSP DIY HiFi Supply. You can e-mail me from there, or more directly: nelson@passlabs. 1. Sep 1, 2011 · After hearing a Musical Surroundings Phonomena at our last get-together, I decided that my next analog upgrade would be a new phono pre. com. I'm currently using a NE5532 IC. It won’t smash atoms like a cyclotron, but it has a really cool name and it is, technically speaking, powered by atoms and very, very good at amplifying music. Pass for bringing another great design to the DIY community! Best wishes from Austria, Martin Strolz Mar 21, 2013 · The Zen has proven to be a popular and enduring do-it-yourself amplifier. Jul 12, 2013 · After finishing the pass labs pearl 2, designed by wayne at pass labs, and falling head over heels in love with records, i couldn't help but want to build a matching preamp/control deck to pair with it and my turntable. TAS Editors’ Choice Award – 2020 The Absolute Sound. Since power supply and gain stage are ready, I think of using The δ1 relay-based R-2R stereo attenuator and The δ2 relay-based stereo input/output selector as attenuator and input/output selector respectively. Mar 21, 2013 · Unlike Nonm, amplifiers are all Nelson Pass does. No, strike that. The XP-32 generates less noise, crosstalk and distortion while delivering greater dynamic range, gain, … Continue reading → Mar 21, 2013 · From a listening perspective, this configuration gave the best results yet. I also found this goldmine of information regarding opamps and buffer/preamp stages. The designer is none other than Wayne Colburg who designed the Whammy and who is quoted in the review : 'We use an optically isolated transistor in the output bias circuit for a couple reasonsthe first being that the transistor is isolated from any input control signal, so there are no artifacts from thank Mr. The preamplifier uses a high pass and low pass filter at the input to set the bandwidth, then an input buffer stage with parallel LM4562 op-amps. Mar 21, 2013 · DIY Op Amps; Son of Zen; The Amazing FET Circlotron Construction, Continued; The Pass A-40 Power Amplifier; The PLH Amplifier; The Zen Amplifier; Zen Amplifier Revisited; Zen Variations 1; Zen Variations 2; Zen Variations 3; Zen Variations 4; Zen Variations 5 Hi Res; Zen Variations 5 Low Res; Zen Variations 6; Zen Variations 7; Zen Variations 8 . More gain than some of us need or want. At the time, he wrote: “I feel that it’s important to support AudioXpress, a magazine with which I have a 35 year history, and which also serves as a mainstay for the DIY community. Thread starter supernet; Start date Pass DIY Apprentice. if it has appeal you can PM me and I will try to help you sort things out. Jul 12, 2013 · Hi, I am slowly progressing with my first DIY audio project. I have looked into the prospect of building a slightly more powerful version, but I'm not sure my heat sinks will be up to it, and the amp is so stable and reliable I don't want to mess with it. As an exploration into the potential performance of a very simple amplifier, the Zen amplifier has succeeded in creating notoriety and some controversy over the last 8 years. com, you will find copies of other DIY projects which will help by providing more tutorial discussions and more examples of op amps put to work. Ultimately I used the Panasonic 451EPC strain gauge (with my own preamp/power source) “the Pass Xs preamp and Pass Xs 300 power amplifier—are efforts to provide that absolute sound without compromise in either quality or price” Xs Preamp TAS Editors’ Choice Award – 2021. Pass. Mar 21, 2013 · THE STORY BEHIND the A75 power amplifier continues. 225,00 excl. 1 MB Mar 21, 2013 · DIY Op Amps; Son of Zen; The Amazing FET Circlotron Construction, Continued; The Pass A-40 Power Amplifier; The PLH Amplifier; The Zen Amplifier; Zen Amplifier Revisited; Zen Variations 1; Zen Variations 2; Zen Variations 3; Zen Variations 4; Zen Variations 5 Hi Res; Zen Variations 5 Low Res; Zen Variations 6; Zen Variations 7; Zen Variations 8 Mar 21, 2013 · way into preamplifier circuitry as manufactured by Dayton-Wright Paragon, DB Systems, and Audio Directions among others. Nelson Pass' Zen amplifiers have generated a tremendous amount of interest over the past seven years. Home; Mar 21, 2013 · Nelson Pass Introduction. Not a "traditional" tube, but a dual triode nonethless. In the mean time, I have been drawn to the Pass Burning amp series. 1K. Mar 21, 2013 · Nelson Pass Introduction. Your Adjustable Preamplifier Circuit seems to fit the bill perfectly because I can select gain to avoid overload of line in . 7 or the Zen balanced line stage preamplifier. 75 KOhm, and it needs about 2. What follows is a pictorial documentation of the H2 preamp build. There was a problem with grounding and RCA wiring, but fortunately it's been solved and I'm listening with great satisfaction. Regards, Scott Jan 13, 2024 · It seems like the best performing audio op-amp that still comes in a DIP package is the LM4562, so that is what I plan on using for the op amps. At one time there was similar MM 3-band thread Jan 12, 2012 · The . Once more from Nelson Pass comes-up this simple creation - BoZ (Bride of Zen): Once more from Nelson Pass comes-up this simple creation - BoZ (Bride of Zen): Mar 21, 2013 · Like Peanut Butter and Chocolate / Nelson Pass / 2002 Pass Labs XA Series Power Amplifiers For over ten years, the Aleph series of single-ended Class A amplifi ers have received praise for their outstanding sonic defi nition, warmth, and… Mar 21, 2013 · Comments and questions are welcomed. Nov 4, 2019 · I have posted the documentation for the ACP+ preamp/headphone amp which is the subject of the DIY build session on Saturday Nov 9 at the Burning Amp Festival. etoiledusoir; 2010-05-12 8:41 pm; 346 347 348. At the risk of eliminating any suspense from this review, they are the two best-sounding examples of a preamp and power amp I have yet heard. The XP-32 is a three-piece modular preamplifier consisting of one control/power supply chassis and two additional gain chassis each containing analog signals of a single channel. This consideration is not much of a deterrent to the average audiophile, however. 51V. 2019 H2 Harmonic Generator – Revised. " Second incarnation comment (ver 1. Mar 21, 2013 · Figure 4 shows the printed circuit board for this project. Jun 15, 2008 · B1 Buffer Preamp . It arrived in just a Mar 21, 2013 · PassDiy by Nelson Pass. 2020 The Square La w. Mar 21, 2013 · At our web site, www. TAS Editors’ Choice Award – 2021 The Absolute Sound. The First Watt B1 Buffer Preamp Nelson Pass, June 2008 Side A So here we are in the New Millennium, and thanks to Tom Holman and THX we’ve got lots of gain in our electronics. It is dual mono where each channel has its own power supply, 5 Single ended inputs, 2 outputs, a fixed output, headphone output, and a built in Khadas dac with usb or coax input. Pass BA-3 Preamplifier After our successful experience with our F5 amplifier project, some ASM members took the next logical step to build preamplifiers. More Jan 21, 2011 · The case is my old NAD 1300 preamp (1990's vintage) which recently died - hence this project. Feb 26, 2020 · Photo Preamp – assembly. 25" and 0. Mar 21, 2013 · This is the second installment of a trilogy of construction projects centered around the performance obtainable from absolutely minimalist circuitry. passlabs. I like this preamp. Thread starter rokikiki; Start date 2021-03-07 10:18 pm; Status but in fact I don't want to go the DIY road with that one. Oct 17, 2017 · Forum Home Amplifiers Solid State Pass Labs Tubes / Valves Chip Amps Class D Power Supplies Headphone Systems. Good luck with your amp. 59V, T6 showed 0. Jun 14, 2003 · After building this preamp with centre of frequency at 3kHz and 90Hz (using the caps values in the . The preamp was used with a Conrad-Johnson MV75-A1 tube power amp driving KEF Reference 101 monitors, and with a Texas Instruments TPA3255EVM Class D power amp driving a pair of Klipsch Forte II speakers. The standard blue LED enlightens this plate from the inside and this gives a nice effect. Populating the PCBs and wiring the amps up was a great couple of afternoons (I built a pair). The Burning Amp Festival is an event every October in San Francisco. pdf) i notice that it has much more noise then any other preamp i build. The Zen, Bride of Zen, and Son of Zen have been explorations in how much objective and subjective performance can be achieved with a single gain stage. so welcome to contact me. 2019 ACP+. com, or more directly: nelson@ passlabs. Mar 7, 2021 · passive preamp for pass aca. Its gain is about 15 dB, which is 10 dB less than most power amps and it requires more signal from the preamp for equivalent levels. Everything in this preamplifier has been homemade, except the nice preamp enclosure that was professionally made. So is this just another audio fad, or is there something fundamental about this kind of design, justifying a revival of the old approaches to amplification? Jul 12, 2013 · The preamp is on all of the time; the power switch on the front of the preamp only controls the Dantimax-supplied boards (i. Effective on March 21st, 2013. 2018 H2 Generator. So I emailed Nelson Pass, and he recommended the balanced preamp. Based on my somewhat simplistic understanding of balanced operation I figure one could use two stereo preamps with the two channels used for the Positive and Mar 21, 2013 · Installment 1 – Supply Filter and Constant Current Source. The Mezmerize is a direct coupled preamp (no coupling caps) based on Nelson Pass's B1 Buffer. I want through a number of cartridges and many recordings looking for the signal source that would produce the highest frequency content. It costs € 1. 2019 DIY Nutube Preamp. Mar 21, 2013 · DIY Op Amps; Son of Zen; The Amazing FET Circlotron Construction, Continued; The Pass A-40 Power Amplifier; The PLH Amplifier; The Zen Amplifier; Zen Amplifier Revisited; Zen Variations 1; Zen Variations 2; Zen Variations 3; Zen Variations 4; Zen Variations 5 Hi Res; Zen Variations 5 Low Res; Zen Variations 6; Zen Variations 7; Zen Variations 8 Mar 21, 2013 · The Kleinhorn Part 2 / Nelson Pass / 2004 If you saw part one of this project (AudioXpress, January 2005), you know that the KleinHorn is a big toy, and you can imagine that it’s hard to resist playing… Apr 25, 2015 · This brought me to shelve the turbo idea for a while and see the "Smoke clear" literally, and maybe I will come back. 2018 Korg Nutube Preamp. Feb 13, 2016 · This is a review and detailed measurements of the Pass ACA Class A stereo power amplifier. Many thanks to Mr. Jun 1, 2020 · I also have need of a decent buffer stage with no gain. Its controls consist of an input selector and a level control. I'm powering the B1 off an old laptop computer PS. General Inquiries: sherilyn@passlabs. Jun 21, 2014 · Schematic of signal circuit. Just wanted to add some thoughts regarding WHAMMY as a PreAmp for F6 (powers Troels Gravesen's Discovery 861 DIY loudspeakers which are awesome) and some upgrades which have been made (Jantzen Audio Silver-Z caps and Sparkos Labs SS3602 Dual Opamp). 2008-06-16 3:52 pm #16 2008-06 Aug 30, 2021 · PASS Labs Pearl 2 Phono Preamp (DIY) The highly regarded PASS Pearl 2 phono preamp. Looking to build the best quality preamp to avoid upgradeitis at a later stage! Any links or advice would be appreciated, after weeks looking online i havent progressed with a decision. Thank you Mr. The SIT-4 is the First Watt power amplifier using the industrial grade Static Induction Transistors. I very much like the larger form factor here and especially the very large Oct 2, 2019 · I brought this preamp with me to Northern California recently and tried this preamp in a couple systems at friends’ homes. The removal of the horn stuffing, some much needed high pass filtering for the DX55’s, and the addition of El Pipe-O on the bottom gave much greater dynamic range and liveliness to a system that was already a show-stopper. Paid Member. Time to tackle this preamp! I have seen that many people have used many different caps. I asked Colburn how he and Pass divide their responsibilities: "Nelson prefers to work on power amps Mar 21, 2013 · Nelson Pass Introduction. That requires a second board, for a total of four channels, and a 4-gang potentiometer. Mar 21, 2013 · A40 Part Substitutions / Nelson Pass / 2000 After 22 years, it appears that quite a few DIY enthusiasts are still eyeing the A40 Class A amplifier design, but are discovering that not a single transistor from this… The final step in the design was however another amendment to convert the pre amplifier to the Pass X operation in keeping with the more contemporary X Aleph power amplifier. For those of you who haven’t heard of the XONO – this used to be Pass Labs top-of-the-range phono preamplifier and still ranks among the 10 best preamps on this planet. Mar 21, 2013 · Routinely DIYers opt to make themselves a “passive preamp” - just an input selector and a volume control. Price: $1000 assembled, kit version price not quite set at this time. Really friendly to listen to. Very nice looking build with custom machined panels and external power supply. I first came across the dii-audio, bought the pass-alep J board and the FET, and I bought the trans and case separately. Jan 26, 2020 · The H2 kit should evolve into a preamp, an ACA should serve as the amp. I feel I don't need the extra complexity and cost of the remote control on the P1. The First Watt B1 Buffer Preamplifier Review See Dick Olsher's review of this unit by clicking here. 615V; I adjusted T7 to 9. Source -> (SSP->[LSA->B1])->Power amplifier This sounded excellent. After all, top-notch audio equipment should be made through hard work, so how can it be easily changed? After listening to the XP-12 preamplifier this time, I deeply felt that the Pass is more mature. My first true DIY amp/preamp project was the Bride of Zen. Jan 22, 2018 · June 2019's Stereophile Magazine carries a review of the $9,500 Pass Labs XP-22 preamp. B1 Buffer Preamp. All, I am intrigued by the following Pass products seem to have and would be very interested in building an excellent (read best bang for buck) pre-amp. It includes a digital supply for an upcoming PassLabs X-Preamp that I what to use with the same power supply. Mar 21, 2013 · Is there such a thing as too big? Certainly there are diminishing returns as we get bigger. A commercial 1000$ amp has roughly ~130 $ worth of parts inside. Robert discusses the construction and subsequent modifications he has done to his DIY Audio kit of the Nelson Pass Korg NuTube B1 preamplifier. 2018 LX-mini Analog Mar 21, 2013 · Nelson Pass Introduction. ACP+: DIY Preamp and Headphone Amplifier Project At the first Burning Amp Festival in 2007, a young attendee, Nelson Brock and his parents Dana and Liz, displayed a nice pair of loudspeakers using the Pioneer Bofu full range drivers in Voigt enclosures. Apr 2, 2023 · This is a review and detailed measurements of the Hypex DIY balanced Preamplifier and headphone amplifier Kit. 2021 DIY Sony VFET pt 2. Depending on the specific input values, its input impedance is typically 4. The Aleph P 1. - The preamp was designed by Wayne Colburn who works with Nelson Pass and designs his preamps and phono preamps. Borbely's site and it seemed to me a right preamp for F5. Later he demo Feb 7, 2015 · If you compare (Pass) DIY and a commercial amp at the same costs, the DIY amp is by far the winner. It uses a pair of 2K linear volume pots. After listening to Mr. The board is available for sale from www. Aug 19, 2021 · For many years, I have wanted to add a low-gain, (2× to 5×) line-level preamp at the input to our home power amplifier. After 22 years, it appears that quite a few DIY enthusiasts are still eyeing the A40 Class A amplifier design, but are discovering that not a single transistor from this design is still available. Add a volume control and you have your preamp. This was a great project and is the heart of my PassDIY audio system. I hooked up an A-B switch and did listening tests against the passive preamp, after setting the outputs to be equal. , the front display and the attenuator and source selection boards). This preamp has a 50 KOhm input impedance, variable gain to about 15 dB, and will deliver the 2. diy Pass B1 Buffer Preamp Mar 21, 2013 · DIY Op Amps / Nelson Pass / 1998 Carl Sagan observed, "If you want to make an apple pie from scratch, you must first create the universe. In 1969 John Linsley-Hood wrote in Wireless World: During the past few years a number of excellent designs have been published for domestic audio amplifiers. The chassis of the preamp was built from scrap 0. They were so well received that subsequently the Brock family hosted a 10 dB or so on a line stage preamp and another 30 dB with a power amp you end up with 115 dB of voltage gain, which is getting up toward a million to 1. It is preceded by the ground breaking SIT-1, 2, and 3 and follows their technical philosophy and construction. Akitika sells a complete, stand-alone, phono preamp kit that includes the preamp, power supply and case (about $250 + shipping), but I wanted to make a custom version, and thought I could build the case and power supply myself. I listened to the new preamp with the 990C+, SK99, and OPA134, both full active and half-passive, and every combination sounds different. The F-5 Turbo is a voltage source amplifier, requiring nothing out of the ordinary from your preamp or speakers. This forum is to discuss the challenges and success in building a copy of the aleph p for personal enjoyment and education. Now with the Neurochrome 686 I've decided to change it from single ended to simple balanced design. I'm happy to hear as good a sound as I expected. We bias ZV8 with a pair of light bulbs, whose resistance offers about 11 ohms and delivers about 2. 7 preamp builders thread. The BA-3 can be seen as the best characteristics of F-5, (with way more gain) and the output stage of F-4, a fantastic "special use" Pass amplifier. 2) from this servicemanual: "The Aleph L is a simple Mosfet stereo preamplifier having four single-ended inputs and two outputs. Do-it-yourself audio enthusiasts from all over gather to show off their projects, listen to talks and equipment demos, and rub shoulders with the rich and famous. What could be better? Hardly any noise or distortion added by these simple passive parts. 505V and T8 to 9. e. i dont wanna say some details of this preamp because everyone should know . mains humming). 4db of gain which is a bit low for power amplifiers so a front end gain stage would be a nice addition. To receive latest Pass DIY news and information, please register below. The F-5 Turbo is the biggest offering in the Nelson Pass/Firstwatt DIY series of amplifiers. Very sweet and relaxing, lots of details, wide soundstage. When completed I can finally replace my old Yamaha preamp with a great one. Now I'm going to try the preamplifier. NuTube website; Nelson Pass' original article Apr 12, 2020 · DIY FirstWatt Pass B1 w/ Korg Nutube Preamp Unit works perfectly Build notes: - Remote controllable volume and input selection - Ultra transparent relay-based I/O selector and volume attenuator - 2 inputs/1 output as built. It was sent by the company and kindly assembled by @Rick Sykora. 2021 DIY H2 Generator v2. I've now started to build the Zen 4. 7 draws very little power and I've been told it sounds better if simply left on. diyAudio Community diyAudio Store. 2 from the diyAudio store. 22uf snubber cap was a suggestion from Wayne, he did a bunch of testing and found that value to give the most benefit in a single cap. After the build, I checked the voltages as indicated in Nelson Pass' documentation for the NuTube preamp: T5 showed 0. g. Any project needs to start with a good PSU - this is an Antek 20+20V shielded transformer, and 317/337 linear regulator PSU from Tubecad. Mar 21, 2013 · Effective on March 21st, 2013. The SK99 is a bit bass heavy for my taste. In Part I, we discussed its origins and direct predecessor, the Pass A40, as well as some general guidelines to follow before initiating such a project. The commercial Pass Aleph P preamp has a pair of gain controls which would have alleviated your problem with too much gain. 00 USD $ 1,095. Apr 22, 2013 · After reading (links ZM posted) I have a question: As ZM told for the FE application you need bigger voltage swing, so like ~30V rail, but people are suggest to power BA-3 from the same PSU they use for F4. It needs volume control and source inputs. 2k 3W was chosen as a bleeder because (yep, you guessed it…) I had them on hand - that value is used as a bleeder in Pass power amps. The following information is for those scouting out substitute parts: After that the logo was engraved. With all these factors in mind, and noting that the output transistors in power amplifiers would enjoy the beneficial effects of cascode operation, we recently undertook the design of a cascode audio power amplifier (Patent pending) where the gain stages and emitter-follower May 14, 2014 · The Pass Xs Preamp sells for $38,000, and the Pass Xs 300 mono power amplifiers sell for $85,000 a pair. Pictures of your diy Pass amplifier. No feedback, no worrying about what type of capacitors – just musical perfection. Home. Audio Designs With Opamps It's not hard to solder your own buffer using an opamp and some resistors. 7, however I Mar 21, 2013 · In ZV8 we dipped our toes into the waters of power JFET transistors using the new Lovoltech LU1014D in a simple circuit. However, I notice that there are several designs out there (BOZ, etc). It comprises the phono preamp and "purist" line preamp. " If you want to build an audio circuit, you will make… Mar 21, 2013 · Cue the Theremin music! This article is about building your own all-FET Circlotron. When a transformer is delivering 1 watt to a preamp circuit, going from a thousand watt rating to two kilowatts isn't going to buy you much improvement. Pass and Karen the Pass diy Diva for assisting with this project. 5 volts at . Pass talk about his stash of parts, I feel like a got few gems. The input impedance is set to 47. Manufacturer First Watt (assembled unit) or Pass DIY (kit version) Phone (530) 367-3690 Website: www. , he now pursues design at his new company, and can be reached at Pass Laboratories, PO Box 219, Foresthill, CA 95631, (916) 367-3690, FAX (916) 367-2193. Mar 21, 2013 · DIY Op Amps; Son of Zen; The Amazing FET Circlotron Construction, Continued; The Pass A-40 Power Amplifier; The PLH Amplifier; The Zen Amplifier; Zen Amplifier Revisited; Zen Variations 1; Zen Variations 2; Zen Variations 3; Zen Variations 4; Zen Variations 5 Hi Res; Zen Variations 5 Low Res; Zen Variations 6; Zen Variations 7; Zen Variations 8 Mar 21, 2013 · B1 Buffer Preamp; Balanced Zen Line Stage; Bride of Zen; Pearl 2; Speakers. tv. After doing research I have decided I am going to attempt to build a Nelson's Pass B1 on solder breadboard. Which offers the best audio performance, which is the most rewarding? Oct 31, 2021 · That's a great first project. Mar 21, 2013 · This phono stage has about 55 dB gain at 1 Khz, and another 20 dB at 20 Hz, and when you add 10 dB or so on a line stage preamp and another 30 dB with a power amp you end up with 115 dB of voltage gain, which is getting up toward a million to 1. The filaments of the tubes are powered by a separate external transformer (25V, 2A), feeding 3 parallel 25V DC heater circuits via a stabilized supply (317-based). Mar 21, 2013 · The popularity of the Zen projects points out the interest in very simple linear circuits. The Circuit. There are many kits available. The relatively low output voltage amplitudes of the switched audio inputs (a turntable and Bluetooth receiver) required adjusting the 1972 McIntosh MX10 tuner and the 240 power amplifier’s volume high if I want to fill the house with music. Will a separate PSU which give ~30V rail be suitable for either applications of BA-3: FE(for F4) and preamp other FW amp? ••• The First Watt Model B1 Buffer Preamplifier Operating at the speed limit! Review By Dick Olsher First Watt's latest DIY offering, the B1 buffer stage, is described by Nelson Pass as "a no-feedback JFET buffer that offers ultra low distortion and noise with ultra wide bandwidth. Aug 30, 2019 · While I was building the Aleph J, I also became intrigued by another recent Nelson Pass DIY project, the B1 with Korg Nutube Triode. Elekit TU-8550 Tube Preamp with Phono Amp $ 899. I also run the Oatley K303 RIAA amp in a separate box which is fine for my old turntable, a late 60's vintage Dual. Extremely quiet and works very well. FIRST WATT I have assembled a total of 55 kits for the occasion, of which I understand 30 will be built on site and the rest distributed in some fashion. Don't forget the golden electronics rule of consumer tech - 1/8 of the street price is parts cost, another 1/8 is assembly cost. passdiy. The diy boards that I have seen (and built) also accommodate this. - External AMB sigma11 linear regulated PSU with oversized transformer Apr 11, 2011 · After having the board for a few months, I finally got started on my Pass DIY B1 buffer preamp yesterday. At Pass Labs we enjoy a small daily flood of e-mail and telephone calls about them, and a substantial number of these are requests for a magnetic phono stage preamp design. The X s Preamp is quieter than the XP-30 and has an even more improved power supply. Mar 15, 2019 · The money standard for a DIY preamp build is probably the "Uncle Fluffy" MusicMan 2-band one: PCBs for DIY clone 2-band Preamps That thread is somewhat inactive and it may take some time to find the current board order info. Before I proceed I must thank everyone involved in making this available, especially you Mr. As far as what they sound DIY amplifier kits, amplifier chassis, hard to find transistors and circuit boards. I'm sure I won't be disappointed Thanks to Nelson Pass. Apr 22, 2022 · I don't think Nelson ever used an enormous slugg-em-in-the-nuts capacitor like C103 (680 uF!) in any of his constant current source designs. An old printer power supply powers in use with this preamp. passdiy. I'm recording it directly from the audio interface, it became worst in the amp. (Model PS-12) Of course you could use the Super Regulator V2. As might be expected from Pass Labs’ history, both components meet their goal. However, I also want to make a preamp for this unit. The problems are different than for power amplifiers – problems due to resistor noise, semiconductor noise, capacitor noise, contact noise, stray fields, little bits of hysteresis, radio Apr 11, 2010 · I am looking for a preamp, either a kit or PCB with list of parts. e. com) since my budget wasn't in the upper 3 or lower 4 figures. Mar 29, 2013 · And as well as Nelson Pass, Wayne Colburn is responsible for creative engineering. It works really well, sounds great. Golden Ear Award – 2018 TAS Sep 14, 2023 · I am a DIY speaker builder and need a good, flat, low noise and low distortion electret mic preamp powered with a 9V battery. 1% distortion or less. This is the build guide for the Korg Nutube B1. Jan 22, 2018 · Video of Wayne talking about the Whammy at BAF 2017 -- Wayne Colburn at BAF '17 PCB available here - WHAMMY Headphone Amplifier – diyAudio Store Given the explosion in the popularity of headphones, as well as the unbelievable amount of choice and variety in the market, it seemed that a simple and great-sounding headphone amp would be a great Mar 21, 2013 · Nelson Pass Introduction. The phono preamp board was $80 (including shipping) so I bought one. Apr 6, 2023 · The passive preamp I'm working on is to match a tube amp I built that sounds great without any active preamp. Components quality is very good, using RN60D resistors, RTE and film caps, etc. Obviously it is much less expensive to use the chassis and power supply, pots, connectors, switches, PC boards, and heat sinks that can be had for the price of a kit than to buy the components individually or have them made. May 26, 2020 · I need a preamp for my Pass F5 I built years ago, just as it is not quite loud enough. 2021 DIY Sony VFET pt 1. 2 amps to the gain transistor. I got too busy with family and career soon after and didn't start doing DIY again until two years ago. Thank you. Oct 24, 2012 · To hide the LSA behind buffer I added SSP - DIY Super Simple preamp (from another forum). Home; 3 days ago · After building the Nelson Pass B1 buffer preamp I was looking for something just as simple but with voltage some gain. Jan 9, 2013 · The Xs Preamp applies lessons learned designing Pass Labs’ breakthrough XP-30 3-Chassis Reference Preamplifier, and the two Xs Series Amplifiers for which it is custom designed to deliver music. Think of it this way: If you are running your volume control down around 9 The Zen amp input makes a preamp do a little more work than usual. Conventional wisdom holds that a pure voltage source amplifier is ideal for audio applications, and generally designers of loudspeakers work to that assumption. Piezo discs have a very low-current output signal and are thus very susceptible to noise from the environment (e. Jul 5, 2008 · Sorry lineup, but I can not be credited for that circuit. The Zen preamp performs brilliant IMHO. Most important drawback of this preamp is its inability to drive very low impedances, but it won't be the problem with F5 (101 k Zin). Power transformers. Side A So here we are in the New Millennium, and thanks to Tom Holman and THX we’ve got lots of gain in our electronics. After 17 years as president of Threshold Corp. Also, the low current and capacitance of the disc forms a natural high pass filter with your microphone input amplifier. I connected the preamp where my Quad 66 preamp was connected: between a hifiberry DAC and a QUAD 306 poweramp. It's mostly finished now, with the exception Mar 21, 2013 · Current Source Amplifiers and Sensitive Full Range Drivers — Nelson Pass / 2004. We already have a speaker kit based on a Fostex 126 that we need to assemble, and the computer-minded of my sons would build the source based on a Raspberry Pi / Hifiberry. The focus of the project was on the JFET itself, and except for a cascode transistor the rest of the amplifier used only passive components. 2020 DIY Biamp 6-24 Crossover. pdf. 33 years ago I decided to build a big horn system. I'm keeping it pretty basic component-wise. Esentally a scaled-up F5, with more output devices and a higher voltage power supply. B1 Buffer Preamp — 2 Participants. xpafmtqmqpyolmmkgclwuirzjpivglvzklkcvxjgzgagogf