Aikido preamplifier. Broskie's Trim 1 single-channel, stepped attenuator.

Aikido preamplifier. Also wanted to try an octal preamp.
Good performance rectifier with its price range. I am using for a guide the parts list that you [DAVE C113] posted awhile back on the forum. In a nutshell, the cascode circuit offers two huge features: gain, lots of gain; and low, very Jan 23, 2009 · It appears to me that the Aikido circuit trumps parts choices in a way which I was previously unfamiliar with. This can cause radio pick up of those spikes anywhere in the circuit and is very difficult to solve. Payment method: Jun 13, 2019 · So, while waiting for the new resistors I ordered to fix the bias on my Aikido ACF boards, I designed a new PCB that will fit in the same location as the Glassware PS-Tube and ACF boards. 1. I am using 6SN7 output tubes. The PCB color is now red, but the real difference is found in two major changes: each channel's B+ RC filter is made up of pure polypropylene (no electrolytic) capacitance and each channel requires its own separate heater power supply. Normal CD players have an output of 2VRMS. Cans - AKG K702, Senn HD580, Stax SR-404, Stax SR-30 Sources- PC, Buffalo 24, Toshiba CDP, Pioneer PL-15R, Rega P2 The typical Aikido circuit (there are many variants) has a two triode voltage amplifier section, and a two triode cathode follower section, both utilizing John Broskie's optimization tricks. I thought perhaps that my first DIY experience, building a tube preamp with John Broskie's Aikido line and Tetra phono stage PCBs, might help other newbies. The preamp has the John Broskie Aikido tube preamp PCB - the LV Aikido circuit (low voltage). After a bit of musing, and an email from John Broskie, I have decided to go for the Aikido octal-tube preamp. Now the preamp, amp, phono preamp (yes that's new), SACD player and turntable will all benefit. Some of the features are listed below: 6 selectable inputs, all with switched grounds to avoid ground loops. So i adjusted the output signal to 100% (I think it is about line level output) and connected the player to the Aikido, and the aikido to the tube amplifier. It seems that Musical Fidelity uses mini tubes in their audio gear, but it is hard to find any technical details or schematics, so any advice which tube to use and what Dec 8, 2019 · For those unfamiliar with the Aikido circuit it is, in essence, quite simple. I'm a total newbie. I use mine with a Dynaco ST-35 clone from Dynakit, a pair of M-125 mono blocks and I've used it with my ST-70. 0A is a bad idea? Jul 20, 2008 · Building a Aikido preamplifier . The Aikido tube topology, created by John Broskie, delivers the sonic goods. Abacus Aikido tube buffer preamplifier based on John Broskie’s ACF-2 Aikido Cathode Follower schematic as described on TubeCAD website ACF-2 is unique in terms of its architecture featuring extreme Dec 23, 2015 · Hi, Am in the process of setting up on breadboard a point to point wiring of a Aikido pre amp with power supply. Looking forward to building the Aikido, will send some comments when I'm done! Thank you, regards, Gary. Jul 13, 2008 · This Aikido phono preamp uses passive equalization, rather than active, feedback-based equalization. Anyone with photos of layout of components would be greatly appreciated. Info: AIKIDO Glassware tube preamp Asking Price: USD $ 500. This preamp has a lot of gain which is desired since it's used with a custom DAC output of about 75mV. Seems to be significant differences R17 is the upper right resistor immediately under the B+ The cap bypasses R11 but on my schematic its definitely C6. This new board combines the B+ tube rectifier and filter caps, DC filament supply, and a balanced differential line stage. But the 6SN7 does edge the miniature tubes out a bit. The regulator would be after the diodes on the DC side anyway. Will be doing P to P wiring for assembly. I found this complete module in ebay, can anyone give any idea is this good PS for Aikido? Anodenspannungsversorgung Platine | eBay Sep 22, 2014 · Abacus Aikido for sale. The overall voltage gain of the circuit is about 8. the sound in combination with the moskido is magic, i have yet to hear a better combo and that is May 12, 2020 · G'day Guys, I've been working through this one for a while now and I have nailed down enough of the design details to do a board layout. 3v secondaries for heaters to the Aikido and after its regulation, the heaters are only seeing 5vdc. For even higher quality separate power supplies for each stage of preamplifier and monoblocks. My last project was an upgrade to my ANK DAC in which I adequately redesigned the tube regulator PCB, but the circuit itself isn't quite powerful enough for an Aikido or CCDA. Aikido is certainly one of the best tube preamplifier I have heard in terms of noise level and musicality. Feb 6, 2019 · Hi to everyone! I have built an aikido preamp using ecc88 tubes and an alps 50k pot at the input. Some use the original PCB ordered from here and some prefer their own point-to-point design. 1 Mar 26, 2019 · As long as you don't get big spikes you should be ok. Feb 12, 2022 · I basically had all of the guts, just needed the case and the AC receptacles. I will probably have to have a transformer built by a local tech here. Also wanted to try an octal preamp. It can be applied to a variety of tubes for line, phono stage, etc. : DIY-Aikido 6SN7 Tube Preamplifier with Salas Shunt RegulatorSource : Media Player D/A : DIY-TDA1541A Sp Mar 18, 2016 · Hi Carlsor Very nice project, while I was thinking and researching about making a new tube buffer or preamp (still cant decide) based on Aikido octal tube PCBs, I came accross with this thread. Thanks again Joe Aikido Hybrid Amplifiers While searching through my huge store old SPICE circuits I have designed over the last two decades, I found this interesting Aikido hybrid design, perfect for driving low-ohmage headphones. Jul 20, 2008 · Building a Aikido preamplifier . I bought an assembled line stage and phono preamp board with some accessories. May 1, 2020 · After all that work removing hum from the Aikido ACF-2 board (see the previous post), it would be a shame not to make a complete preamplifier with it, and this is what I did. Item #650036304. Nov 1, 2023 · To the point. Us Nov 11, 2023 · But I think the transition was pretty smooth. Jul 20, 2008 · Building a Aikido preamplifier. May 7, 2007 · It seems that common dogma is that the preamp should be switched on before the power amp and that the power-amp is switched off before the preamp. Jan 8, 2016 · I also used the line stage in a Sherwood S-5500 that I had converted into a preamp after robbing the power and output transformers (I had always wanted to do this). Mar 4, 2013 · Hey guys. I attached the sextupler with the values for the Aikido 18vac capacitors. There is also a separate table of recommended parts values for certain tube combinations. The preamp features regulation. And while I am at it, let point out that it’s the Aikido second stage that defines it as an Aikido circuit. Outboard power supply for ultra quiet operation Sep 24, 2011 · Aikido is designed to have superb PSRR by design, but it helps with a solid & well filtered power supply. I intend to have a go at one of these soon as well. These entries represent the best phono preamplifiers we’ve heard. Jan 20, 2020 · I picked you this half built Aikido pre amp with headphone out. It offers low distortion, low output impedance, a great PSRR 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. Which tube is preferable as far as linearity, distortion and subjective sound quality, all else being equal Dec 18, 2008 · 12AU7 (ECC82) Cathode Follower Tube Preamplifier Schematic. This preamp/headphone amp is the culmination of the separation of the DAC I had posted before and Aikido amp stage I was using with it. The enclosure is from Modushop with front and rear panels custom made and engraved by Front Panel Express . -inadequate post rectifier filtering. as some of you saw, im looking into getting a new tube preamp, and a kit is (as always) my most interesting option right now. A stereo Aikido line stage consists of four dual-triode tubes, a hand full of resistors and one capacitor per channel for output coupling. Aikido Phono preamp, Rev. 6v so I purchased a 6. Jul 20, 2008 · I built my first Aikido and used both the 9 pin boards and the 6X5 power supply board that was available here at this site before John went into production on his Aikido boards. I have already ordered a couple of Octal All-in-One PCBs - I'm planning to use one board for each channel, operated in a fully balanced configuration. Jul 20, 2008 · nOOb heater PS question Hi, I have the Aikido Rev A all in one 9 pin board and I'm working on the heater power supply. I have done a lot of listening tests and it is always a winner. They worked very well indeed, and I am really happy with the sound now, especially using this in conjunction with the new preamp, which will get its own thread shortly. Nov 1, 2023 · SOLD - FOR SALE: AIKIDO Glassware tube preamp Watch Report This Ad. I see the pdf from Aikido has a good amp schematic but I,m in need to see the PS section in detail. Get the retro look combined with the modern sound of a new gen PAS built around the popular AIKIDO line preamp with solid-state power supply. Thread starter ollebolle; Start date 2008-07-20 1:34 pm; Prev. -to large charging spikes caused by oversized transformers or oversized filter caps. I am using tubes that require 12. The $1485 PV-5 is a "budget" version of C-J's $2850 Premier Three preamplifier, but according to the manufacturer it embodies much the same kind of circuitry. 3 inputs, one output; Remote controls on/off, volume, input selection. ) 3. Jul 20, 2008 · Probably the most complex build I've done to date—in terms of options and configurations and high voltage!—I tried to simplify the process (a hair) by just following John's "test" build as described on the Aikido Noval page of the version I built here: Aikido Noval Stereo and selecting—12AU7 input tubes and JJ ECC99 output tube and all Nov 15, 2021 · Just finished a new project. The CCDA has the option for using a small amount of positive feedback for more distortion. 00. Aikido hi-end vacuum tube preamplifier 6n2p-ev + 6n30p-drwww. The advantages of a "passive" equalization come to bear here in a remarkable form. Does this mean that using that using rectifiers 6. Aug 12, 2010 · Aikido Amplifier Topology B+ Rk Rk in out R16 R15 Rk Rk C13 6GM8 Rg Rgs Rgs Introduction to the Aikido Topology In the schematic above, the 6GM8 triodes are so specified for example only. Are you still happy with the sound quality? The Aikido with 24 hours on it sounds far better than the Musical Fidelity F22 ever did. 1 … Go to page. Jul 20, 2008 · I have a Squeezebox music-player with integrated volume control. It holds two Aikido gain stages per channel and uses a passive RIAA equalization network in between the two. Jun 13, 2019 · I will likely build an Aikido preamp sometime in the next year. I will only attenuate one channel, so basically I will use a 2 resistor Apr 26, 2019 · MP-701 supports 12AU7, 6922, 6DJ8, E88CC, 12SN7 and 6SN7 preamp tubes. 30 sec start-up output mute for safe operation with solid state power amps. First impression is of astounding bass. PT - not sure what to do here yet to feed all the filaments/heaters etc. May 19, 2013 · Wonderful Aikido tube preamplifier, based on John Broskie Aikido schematic. Feb 23, 2018 · I just wanted to chime in about Aikido circuits in general. Jul 19, 2015 · Aikido Phono preamp, Rev. I think for around $120 shipped you can have a nice little Aikido Preamplifier. When using 12AU7 and 12SN7, S3 onboard switch must be set to 12V position. Many of them during warmup produce horrendous bangs or plops so severe that every speaker fuse in the system blows. In the worst case the effective output impedance will be approximately 20k ohms. They are organized by price in ascending order. Feb 2, 2021 · Since you have the pictures of both sides of the PCB it is not that had to make a drawing of just the first stage. The 6GM8 (6N27 / ECC86) tube is perfect for this low voltage application - 24 volts B+. 600. After building Nelson b1 and opamp based preamp this is the one I feel superior in sound quality really Sep 18, 2016 · Abacus Aikido for sale. I have not tried them yet, as I am slightly nervous to drop them in as I don’t know if they are a correct sub for the 6cg7 noval in this This is going to replace my Anthem Pre-1, a fairly highly regarded mu-follower tube preamp with a separate tube rectified power supply. Building a Aikido preamplifier. I cannot find 12sn7s available Oct 31, 2023 · The Aikido preamp uses a half-mu amp, so it's gain is nicely predictable and you can plug-and-play different tube types if you want to try tube rolling. The line stage then brings the output of the sources up to that needed by an amplifier. My Aikido preamp (sold to me by a hobbyist who made his own) is right up there with my other best preamp made by EAR Yoshino. specified part choices. I started my preamp project searching for an excellent and reasonably priced kit and found almost universal acclaim for John Broskie's circuits. The basic voltage amplifier/cathode follower arrangement has been used in many preamps, but there is more than that here. However, since I was not confident in my Jul 20, 2008 · Howdy Captn I'm using Rev B (Aikido 9 pin) documentation. Jun 13, 2019 · My understanding is that as the Aikido uses dual-triodes in a totem-pole arrangement the voltage on each plate in a single tube will be half B+, making the required B+ voltage 180V. 3 inputs, one output Remote controls on/off, volume, input selection. 5, driven by modified WPA 3. Add an input filter to stop AM reception that does not interfere with the device its qualities and you are done. The tube compliment is 6N1P-EV and 6N6P pairs that are ideal for low noise and low output impedance operation. I lived in a very rural area and the power was noisy and fluctuated between 120v and 127v. Do these sound good? Anything I should know about it? Jan 26, 2023 · Hello all! Abacus Audio Aikido Tube Preamp. The sound could be described as open and effortless, with incredible detail and resolution. It sounds really close to a tube rectifier power supply. - All four stages (input & output stage for each stereo channel) are then brought to one point (star ground point?). When compared to the Ref 3, with a single-ended input from my Cambridge CD player, the Aikido can hold its little head high. Jun 13, 2019 · That's a lot of tubes! If your preamp works out well, will you use the same power supply section for this as well? Thank you for the boost, I hope you're right. Amplifier. The circuit is basically a low noise, low distortion, low output impedance, no global feedback loop one. The circuitry used in this PAS-NG kit is based on our very popular AIKIDO Combo Kit, kit#13 , consisting of our Z-PH10 phono preamp, the AIKIDO line preamp and our top of the range Solid State Regulated An Aikido pre-amp / line-stage. Aikido Phono Preamp . If you have been tempted to try an Aikido preamp (i. Jan 16, 2005 · Aikido preamp Building a phono preamp based on the Aikido circuit is a promising path to follow, as low noise is so important in this application. 4*6sn7 2*250v w ct 38v drop across r17 (1500ohm) and janus shunt. The unit was built with the following: 1) Manley Labs RCA jacks 2) All silver plated copper wiring. comRega P25 has gr Jul 20, 2008 · ALERT - NEW AIKIDO TOPIC OK, so I built the Aikido all in one Noval - with 6N1P on front end and 6H30 on back years ago - sounds nice! But something has always annoyed me - I hooked up the Hammond tranny (way overkill, but all I had when I built it) and have the 6. Abacus Aikido tube preamplifier with remote. Oct 4, 2012 · Hi, I have aikido preamp and I would like to measure its output impedance. com Jan 13, 2013 · For Sale - 6SN7 / 6SN7 Aikido Preamp board - fully populated and ready to be dropped into a preamp. The two I'm considering are based on the Aikido circuit. For higher quality, high quality separate preamplifier (with super channel separation) with monoblock amplifiers. I am not very experienced with the design side of these sorts of electronics, so I am thinking something like the Aikido kits/pcbs would be a good middle ground for me to start off with. Feb 11, 2014 #1 Aug 29, 2013 · Hi, I am building Aikido preamp and I red many reviews and posts regarding the power supply which, most of project builders have used solid state designs. Jan 25, 2016 · Abacus Aikido tube preamplifier with remote. Why not an Aikido you say? A gain of one is just what is needed any higher gain is burned up in the attenuator. In other words, four Aikido gain stages May 19, 2013 · Wonderful Aikido tube preamplifier, based on John Broskie Aikido schematic. Feb 4, 2018 · Aikido All-in-One PCB with Tube Rectifier All-in-One Aikido & Vertical vs Horizontal Tube Rectifier heater voltage If I'm not mistaken the 5Vac is connected not only to the heater but the B+ supply as well. Jan 30, 2023 · I’m going to place them into an Aikido Line Stage Preamp I’m building with high-end components like Duelund Cu coupling caps and tube rectification. This pair contribute an order of magnitude more difference to the perceived bandwidth than does the preamp and hence changing its bandwidth from 300KHz to 700KHz would be completely inaudible. I have both of these tube types and plan on using octal to mini 9 adapter when using the 6CG7's. I'll order a single stereo board and get going with the project. Based upon John's suggestions I will be using the JJ ECC802s in the first stage and the JJ ECC99 in the second stage. I was also planning using 7193 instead of 6SN7. hi-endtubes. In other words, four Aikido gain stages reside on the PCB. A final shoot of my Aikido Preamp. With excellent extension and pace, it is dead silent and just missing that last bit of refinement that the Shindo has. Apr 12, 2016 · I have completed my build of John Broskie's Aikido PH-1. That brings me to my other news. Updated Aikido LV and 12Vac Aikido PCBs Both the the Aikido-LV and Aikido 12Vac PCB are in a new revision. I want to implement a LR channel balance control and I have one of J. Overall, I’m quite satisfied with this as my holiday project. now i just need to choose the right kit! i am trying figure out between getting an Aikido preamp (or any other model from glass-ware) and getting an By the way, since I am so weary of hearing how the Aikido circuit is some sort of SRPP derivative, let point out that the Aikido’s input stage is not an SRPP stage. I decided to use the "standard" 12ax7 12at7 configuration for various reasons, and I think I chose correctly - the sound quality is simply astounding. I built a noval Aikido using Bas's boards and have been very satisfied with that project until very recently, when a few component changes were made to my tube system. 24-Volt Aikido amplifier The 6Gm8/6N27P/ECC86 dual triode was designed to be used as an RF amplifier and as a self-oscillator mixer in a car radio, back when car radios held tubes. OK, another AK'er (will let him reveal himself if he'd like) and I will be building a couple of Aikido preamps using GlassWare's All-in-One Octal boards. Getting everything into a single chassis will be the biggest challenge. Preamp has two pairs of switchable single ended inputs and one pair of outputs. Feb 11, 2018 · Abacus Aikido Tube for sale. Super clear. Feb 10, 2005 · Can anyone tell me whether I am going to pay a significant penalty in sound by going with a 24V 6GM8 based Aikido versus a high voltage 6CG7/6H30 Aikido. Do you have a schematic of the project you could send me to use as a guide . The Aikido noval stereo boards and part kits and Stereo-Freq switch are available now at the GlassWare/yahoo store. Outboard power supply for ultra quiet o Jul 20, 2008 · Hi guys, I'm just about to order the Aikido Stereo 9-pin kit from JB. I'll use the following power supply topology which I got repeated good results in the past. 1 tube 2x triodes per channel. 3 inputs, one output. At least the schematics I have seen. A passive equalization network could easily be nestled in between two Aikido gain stages. I replace the 5U4C tube with 5U3C/5U4GB Sylvania Black Plate rectifier. No expense was spared to source the best available components and parts in building this one - potted NOS power transformer, rhodium RCA connectors, PIO and Mundorf coupling capacitors, precision Kiwame, Dale, Holco, Mills, and Allen-Bradley resistors, etc. Since your building a 12v version you should be ok. Firstly a bit of background as this is not my first rodeo with the Aikido. Outboard power supply for ultra quiet operation. This seemed like a good place to start as it sat in between the recommended voltage for two 6DJ8 tubes (150V) and the 6CG7/6DJ8 combo (200V) as listed in the manual. I bought my 6SN7 Aikido from Erhard Audio, but I think he has discontinued that preamp. I can't decide between the one using 12Au7 and the one using 6CF7/6FQ7. Just my opinion, but the note on the Amity schematic says the preamp needs 2k or less output impedance, or you have to use a transformer volume control (and to make the impedance low, that transformer setup will have a voltage loss). all cable by signalcable. Note that it is inverting. e. 5 monoblocks, and those 4" Fostex drivers let me hear the details I've been missing Without a name, a circuit will quickly disappear from memory (and Google). Highest quality Kiwame, Dale, Jul 20, 2008 · This is good news :nod: :D The total current will be: (5+5mA for 6N1P and 20+20mA for 5687) Total around 50mA! 50mA is within the limits for my choke :) The 5687 will draw about 20mA with my B+ at 220V Now I know how to read the table :D Thank you all for the good help! Aug 30, 2014 · Aikido Tube Preamp Build - with Remote! Thread starter Markus111; Start date Feb 11, 2014; Markus111 Big Horns & Many Tubes. 33; 34; 35 HI all As many of them know about this Preamp. I have decided on the Aikido 5687. I like to share my build Aikido 12Vac Preamp build as name suggest it needs only 12 V ac to operate. Feb 17, 2013 · Aikido Preamp - It is very nicely constructed, and sounds excellent. 3Vac @ various amperage's from 1. This mono preamp gets it inputs from the line preamp outputs, usually our TCLA tone control preamp or our Aikido classic line preamp and should be installed with its own 100K single gang volume control at the input, so that the center channel speaker can be independently controlled as well as being controlled by the main PAS volume control. I think this project is the real high-END for a preamp. Everything is included to complete the build except for a chassis. This is the 6GM8 version, not the 12AU7 version. The preamp was designed to be as general and setup-friendly as possible. Read 3426 times. I am selling it to fund my numerous other projects that are awaiting completion. Presently I am listening to the Aikido using the 6DJ8 tubes. What is an Aikido PH-1? The Aikido PH-1 is an excellent tube-based phono stage. I did not find anyone who built an aikdo with submini tubes, this gives me a challenge. Uses 6SN7 octal tubes, has dual mono regulated power supplies for each channel, for both B+ and filaments. I am familiar and love the sound of the 6CG7 and 6H30 but I have no idea how the 6GM8 sounds? For me to build the 24V version would be easier, smaller, lighter, cheaper Jun 18, 2017 · Glassware audio has 2 low voltage aikido pre amp kits that are quite reasonably priced. B The Aikido PH-1 returns—and yes, it has been a long, long time. Jan 23, 2009 · It appears to me that the Aikido circuit trumps parts choices in a way which I was previously unfamiliar with. I use it between the output of the RIAA preamplifier and a SET power amplifier. You could drop in Feb 27, 2022 · Unless a 6SN7 preamp has a cathode follower output with very low impedance, it will not properly drive the input transformer of the Amity. The passive equalization network sits in between two Aikido gain stages. Custom enclosures of TBD design. Most preamplifiers I have seen have though, have the potentiometer first, so does the Aikido. I have gone through a lot of preamps under $5k . I like the look of the octal preamps, but Aug 1, 2024 · I am currently running this from a Yamaha CA-810 acting as a pre-amp. 2A all the way up to 4. While I was deciding on the above I have started this: Aikido PH-2 Phono Stage Mar 2, 2013 · Got mine built tonight, my aikido octal/6sn7gt is a little darker then this slp-90 clone from fleabay, all in all im enjoying it, nice and quiet Search Everywhere Threads This forum This thread Aug 4, 2013 · Wonderful Aikido tube preamplifier, based on John Broskie Aikido schematic. This schematic below is a simple two stage line-level preamplifier using a single 12AU7 (ECC82) tube per channel. One day the PT went out and started filling my living room with the smell of burning electronics. it is dead quiet with the pcb ground tied directly to earth from iec inlet. 12V trigger output. Its advantages lie in the sonic area. You pay for it with 3dB worse signal to noise ratio, but you probably won't notice this in a line stage. Mar 8, 2016 · Abacus Aikido Tube for sale. For example, a6SL7 input tube (V2 & V3) will yield a gain close to 35 (mu/2), which would be suitable for a phono preamp or a SE input stage; a 6SN7 (5692) or 12SN7 input tube will yield a gain near Aikido Cascode The Aikido Cascode amplifier is a compound circuit consisting of a cascode input stage amplifier and an Aikido cathode follower output stage buffer. Jul 13, 2014 · I chose the 6SN7as I like the sound, gain is about right and I have a bunch of them. This seems to be particularly the case for SS power amps. Broskie's Trim 1 single-channel, stepped attenuator. So I load the preamp with 15k resistor, generate 300Hz sinewave. 6 inches, and mounts identical to the original board. The power supply was built on PS-1 kit also available on TubeCAD. John suggested that I try either 12sn7 tubes (4) or mix them with a tube such as 6DJ8. Thank you 18 April 2015 . A line stage is needed either to boast a weak signal voltage sufficient to drive a power amplifier to full output, or to deliver current sufficient to drive a high capacitance load. In other words, an Aikido amplifier can be built in a near ly infinite number of ways. And Mr Broskie, I bought an Aikido stereo linestage kit from you some days ago, and I received it just this Monday. My current setup requires no gain preamp, and since I sold my 2a3 monoblocks it seems that I may no longer need this one, and I will not build anymore of them. Subscriber. (Power supplies separated, higher cost. I am burning it in with Tekton OB4. Jan 13, 2024 · Hello: A while back I've built an Aikido preamp using 6N2P and 6N1P tubes. Free shipping within lower 48 states. It is the best looking and sounding Aikido preamplifier that I’ve built. If using 6SN7 tubes, 6SN7 to 6922 adapter is required. When using 6922, 6DJ8, E88CC and 6SN7 tubes, S3 onboard switch must be set to 6V position. It sounds freakin great but at the same time not doing the Yamaha justice. Blog 247 covered the cascode circuit, so it's worth reading, if you haven't already. Jul 6, 2008 · The time has come… Saturday, 6 July 2008… The Aikido Blind Test session at Tubelover, South Jakarta, Indonesia. ) How it works. It's been a fun project. I am planning on using a 24vac transformer and 5814A tubes (12AU7 similar). Why Tubes? Jul 20, 2008 · Thanks kacernator, Just to check whether I understood you correctly : - each Aikido channel has 2 stages, so each stage gets its own ground point. The only thing I dont like about the aikido is the addtional tube count so I went with the CCDA circuit for this one. According to the table provided by John Broskie, output impedance at 300V and 10mA (240R cathode resistors) should be around 500 Ohm. Enjoy! Schiit Audio Mani ($129 USD) If you ask Dave McNair and Eric Franklin Shook, they will tell you that the Schiit Mani phono preamplifier might be one of Schiit’s top three products ever made. May 14, 2011 · Tên mặt hàng: Bán KIT AIKIDO tube preamp và JANUS regulator của TUBECAD Tình trạng, mô tả: Đã qua sử dụng Giá bán: 1. Although they would never fit on the printed circuit board (PCB), 211 and 845 triodes could be used to make an Aikido amplifier. Aikido pre-amplifier. Jul 20, 2008 · here is my aikido finally finished and feeling at home in a for what i think a nice cherry wood housing. I have a few things to say about it. The AIKIDO circuit delivers the sonic goods. By cutting the highs and boosting the bass, the phono stage’s inverse RIAA equalization of the LP’s RIAA equalization curve returns the signal to flat. This is the real beauty of this preamp. I haven't heard the grounded-grid preamp. Mar 8, 2024 · Another Aikido preamp build : Page 2 of 4 [ 34 posts ] Go to page Feb 23, 2018 · 180 ohms unless you add volume and balance controls after the output of the preamplifier. The Aikido I built used a dual regulated supply that cost a bit of $$. The Aikido-LV got the bigger change, as it can now either use a single DC voltage, say 48Vdc, to power both the tubes and the heaters, assuming four 12-volt heaters in series, or it can use two power supplies, a high-voltage one, say 48Vdc to 100Vdc, and a low-voltage one The 510k resistor adds some Aikido mojo and greatly improves the PSRR, which is critical in a headphone amplifier. 34; 35; 36 Oct 30, 2014 · I'm looking to build one of the Tubes4hifi preamp kits. Various tubes are here, small 9 pin tubes, Octal Jul 20, 2008 · Buzzing usually has two sources. Gain of 12AU7 (20) is good for my need (that's SRPP preamp I have now) . The Aikido is not as resolving or dynamic, nor does it have as much musical drive and flow as the Ref 3. 31; 32; 33 Jul 20, 2008 · I don't exactly know the answer, so I will have to guess I have seen tube preamplifiers with built in riaa-stages, and of course the potentiometer is placed between the riaa circuit and the preamp circuit. 2. I have a Glassware Aikido preamp that I have decided to sell for $500. I’m looking for in production tubes, since I already have a matched pair NOS Siemens E88CC. It sounds even better in resolution and clarity. Jun 23, 2013 · This is Aikido tube preamplifier that I built for myself and was enjoying it for quite a while. Oct 21, 2023 · Seconding the Aikido (although in my case, I went with the Aikido LV with 6GM8 tubes). The 5mA constant-current source loads the single 12AU7 triode and the two 40mA constant-current sources allow the horizontal layout of the SRPP output stage. The power supply board documentation can be found at Compromised URL removed by Moderation It shows a easy to build power supply complete with heater bias. It came with a real nice set of JAN 5670 tubes glued into adapters from “ifi”. I built the Aikido with 2 sets of outputs because I had been running dual sub-woofers but left them off to begin. com SP14 kit which I have absolutely loved the sound of This is the last Aikido preamplifier I built and kept for myself. If it is this it will appear as a small Oct 4, 2008 · One shoot of the Aikido with 5U4C rectifier. 000 Khu vực: Hà nội Điện thoại: 0934525338 Giao hàng: TQ Thông tin thêm: Như tiêu đề, do chuyển sang chơi DHT nên em bán 2 bộ tube kit như sau: 1/ AIKIDO tube preamp: May 21, 2024 · My post is basically related to the fact that a DAC with 2V+ RMS probably does not need voltage amplification, and two tubes are enough for that, not four. It was that preamp that really got me going on the Aikido circuit, and my friend absolutely loves his. All with John Broskie Aikido Pre-Amplifier design. With sympathetic tube selection, the Aikido can be an overachiever that will challenge much more expensive commercial amplifiers. IMO, the Aikido is a much better option than the PAS 3 as it has 40+ years of advancements in technology and theory. 22uf caps and Wima 10uf caps. Various tubes are here, small 9 pin tubes, Octal PAS-AIKIDO Line Preamp Upgrade Kit assembly and installation instructions 02-2022 v1 Overview The circuit board is the same size as the original PC5 board, 5. Jan 11, 2022 · Hello, Looking for a good 6SN7/ 6CG7 Preamp Schematic. #1. I highly recommend the circuit. May 13, 2013 · Nice board and layout, very compact. The output stage of the circuit is a Cathode Follower and is suitable to drive a low impedance amplifier. This is not an All In One, so a suitable B+ and heater circuit is required. Sep 5, 2022 · Hello! I am interested in building a tube preamplifier for myself. : DIY-Firstwatt J2 (Cloned)Preamplifier. 0 Members and 1 Guest are viewing this topic. Rega p25-Denon 103R-Bob's Device-hagerman Cornet 2 Phonostage- Aikido Octal linestage-Denon poa 1500 - Axiom M60. uses four 12AU7 tubes. My first was a Tubes4hifi. Does anyone have experience of this with an Aikido preamp? Using Bruce Anderson's Nov 26, 2021 · The Best Phono Preamplifiers. Oct 12, 2009 · The Aikido preamp is a novel circuit designed and published by John Broskie. So the money can be invested in better components instead of two additional tubes and their power supply. There were some mistakes on the board which I discovered and corrected. 3v - 6. 6 x 3. The 20k ohms and the cable / amplifier input capacitance will form a low pass filter which could put the cutoff frequency in the audio ba Jul 20, 2008 · Building a Aikido preamplifier . I have a few dilemmas at this point. The shipping is very reasonable from this company as well. Firstly, I'm extremely impressed at the quality of what I've been sent. Working very well with my Cary PP 300b amp. 12V Jul 8, 2022 · I third the Aikido. About a year ago I bought an Aikido Noval (rev F) kit and a PS-21 power supply from GlassWare Audio. Mar 18, 2009 · I built already a 6CG7 & 5687 aikido preamp and 6SN7 & 6N6P aikido headphone amp. Jun 13, 2019 · The Aikido instruction manual contains a large chart of tube types and example operating points with their corresponding parts values. Highest quality Kiwame, Dale, Jun 13, 2012 · The source is unlikely to have any significant content beyond 25KHz and the power amp (if tube based) would be lucky to be 3dB down at 60KHz. Jan 16, 2024 · Separate preamplifier with basic amplifier, extra ics needed. A few component changes and I should have a B+ of about 180vdc. Feb 22, 2015 · I am in the process of obtaining parts to build Aikido Octal Preamp. So the obvious solution is to build myself a preamp. Jun 11, 2014 · Jun 11, 2014. If using 12SN7 tubes, 12SN7 to 12AU7 adapter is required. Oct 1, 2021 · I am trying to build a tube preamp that can be used as a line stage or Headphone amp. I also made an Aikido preamp with four tubes, before the ACF. I was donated 4 6N1P valves from a very kind member from Netherlands. Anyway, I love my SP14-style Aikido preamp--I did a scratch build just for fun, but I've also had an SP14 here for upgrades for a friend. So now, the case and receptacles should be here soon. 4. Nov 2, 2006 · Thing is, Aikido has been discussed a lot already and you will probably learn lots from reading old threads, and off course tubecad. The BCF drives the interconnects and power amplifier easily. 3) Obbligato copper output caps 600V 4) Special connections to allow tube Description : This small AIKIDO phono preamplifier module inspires not only because of its technical data. There is an option to make it a "Aikido 18vac" using a higher voltage power source and 12AU7 tubes. Aikido Phono Pre-Preamp Since the Aikido is known for its low noise and low distortion, it would seem a natural for a pre-preamp—and it is, as long as one is willing to accept the higher noise that all tubes must intrinsically add, because of their low transconductance and high plate resistances. Jul 8, 2018 · Hey all, I just picked up an Aikido Noval pre that uses 6cg7 and 6dj8 tubes. In other words, the Aikido Dec 21, 2010 · I have a 24v Aikido with 6GM8 tubes that I use as the preamp for my speaker amps and its also my favorite headphone amp for my dynamic cans. Aug 3, 2010 · The ACF is very clean and very quiet. Found a link on the web about reducing the game of the Aikido board. Jun 30, 2021 · Folks: About 15 years ago, Bas Horneman hosted a couple of group buys for Aikido preamplifier pcbs (as I recall, this was before John Broskie began selling boards). Aikido Octal Stereo Rev F This is a major new revision of the old Aikido stereo octal PCB, Rev. I have used this volume control to limit the signal to my my RH84 (an EL84 SE tube amplifier) before I built this preamp. This preamp is built on a custom aluminum chassis with 6n1p - 6n6p tube pairs using Hammond iron, Alps Blue volume It is the best looking and sounding Aikido preamplifier that I’ve built. . 3 transformer. The 12 volt can run from a simple wall wart or switching power supply. They are very high value. Includes tubes, resistors, PS and heater bypass capacitors, two sets of coupling capacitors (PIO and film), printed circuit board, ceramic tube sockets, and board stand offs. Is super quiet, very linear, and very easy to assemble. What makes it interesting are three features: a class-A output stage and a wonderful PSRR and a free heater power supply. So here it is: the Aikido Amplifier. All sound really good. I've played around with different Rk values as well as several different octal tubes and come back to this tube combination. Jun 13, 2019 · For the last 2 days I have attempted to do it your way so I can try and change the PS-21 board for all film caps in the B+, more room for the heater film bypass caps, more room for the diode locations and adding screw down terminals for the ins and out of the board for serviceability. F. 3-0-6. com IN the case of a 12AX7 as the first tube you will get a gain of about 50 from this preamp, this is way to much for preamp duties. Remote controls on/off, volume, input selection. The gain was very high. For example, the following is also an Aikido circuit. (Since it could form the foundation of a phono preamp or a tube-based headphone amplifier, "Line" has been dropped from its original title. Go. Aikido Line Stage Amplifier Kit (octal-based & stereo). Tubed preamplifiers have a well-earned reputation as system busters. I've had a 12AU7, 12AX7 and now a 6SN7 version. Dec 3, 2003 · As I was finishing up my newest DIY solid state bass preamp I found a few ideas that I thought might improve performance of this line driver as well. Total we have 11 contenders today. Preamp has four Tung Sol tubes with about 200 hours on them, and has Russian . Sep 1, 2023 · I think a line stage is also necessary since the gain of the phono stage is about 45dB or less which brings the output of a Moving Magnet cartridge (4mV) up to a level that compares with CD players, for example. line-stage amplifier) out, this is the one to try. I was left with my jaw on the floor after swapping out my Shindo VR pre. rxwxk lqooznd ylne ofby sitopm qjsnzj pbzt uaz uqegm riag