Aikido preamplifier. Passive mode and active mode for the line stage outputs which Jul 20, 2008 · Orignally I intended to build the Aikido with ECC88 and 5687 but since the 5687 consumes so much heater current I decided on using 12SL/N7 with a 12V heater regulated supply rated at 2A. Post subject: Re: Another Aikido preamp build. It's been a fun project. Policies. Octal 6sn7 Thank you, Ron specified part choices. The students of the TubeSociety academy design and construct each year their own masterpiece. Shop aikido hifi preamplifier on AliExpress: If want to save a lot of money while still being able to pay for aikido hifi preamplifier, there are plenty of ways to save money, such as deal hunting. 4) A textbook 6SN7 aikido like the old SP14. 2) All silver plated copper wiring. In they decided to make an all valve preamp with moving coil or moving magnet input, a line stage, a balanced active input stage, completed with a headphones amplifier and a buffered Jul 20, 2008 · 1) Use R17 - value again picked from the table depending on B+ and output tube selected (100R-600R approx) 2) Short R15 and R8. Jul 20, 2008 · I might try and reference 1/4 b+ with that center tap Like :) Jun 18, 2020 · Hey guys. What is an Aikido PH-1? The Aikido PH-1 is an excellent tube-based phono stage. Preamplifier sounds amazing. In other words, an Aikido amplifier can be built in a near ly infinite number of ways. -inadequate post rectifier filtering. If I use this heater supply for an ECC88 - 5687 Aikido can I wire the 2 5687s for 12V heaters in parallel (each at 0. g. 3) Insert C8 over R11 (47uf-1k uf 10V) Click to expand I wonder if you and I are looking at the same users guide. Najbolji zvuk je trenutno sa 6N3P-EV lampama NOS iz 1983, gold grid, Viniza fabrika iz Ukrajine. 12AX7s are quite useful in an Aikido circuit if you are building a phono preamp (e. I haven't heard the grounded-grid preamp. According to the table provided by John Broskie, output impedance at 300V and 10mA (240R cathode resistors) should be around 500 Ohm. Thread starter ollebolle; Start date 2008-07-20 1:34 pm; Prev. This is the 6GM8 version, not the 12AU7 version. John suggested that I try either 12sn7 tubes (4) or mix them with a tube such as 6DJ8. Jan 9, 2016. I am a little confused by the wording in the Aikido manual. 3V going to the 6X5 rectifier 1 x 12. 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. , two Aikidos with a RIAA eq circuit between the two). 2009-05-24 5:22 pm. My price has risen because I have kept improving the parts and design and made all the options standard. I always looked at it as a half-assed work around for a crap power supply. Point-to-point wiring, Alps Blue Velvet volume pot. w/ Newer RR 6H23N-EB Tubes: Tube Preamplifiers: $750. 25V (3A) Well, the Preamp is singing now. 00: FL Aug 16, 2022: 2 : FOR SALE: Audio Research LS7 Tube Preamplifier - Ex. Comes with 4 RCA Cleartops (Conn-branded) with plenty of hours on them. I laughed out loud. 6) Quality Hammond chassis. Jul 20, 2008 · I have no idea if this makes sense or not. Yes, I'm using JB board as well. The order was processed (email received) but the card was not charged. 600. It is a cost no object design without all the ridiculous markup and hype of the high end industry. Hi, 6H8C are the Russian 6SN7 equivalent. Guess what, you can even find discount vouchers, coupons and other money saving deals of aikido hifi preamplifier on AliExpress. 3 inputs, one output. This is a very solid build: exceptional parts quality throughout, large and heavy par metal case, elna stepped attenuator, etc. I used the same bridge with these resistors and caps over the diodes! (it's called snubbers I think) After the bridge I put 47µF -> 820ohm -> 150µF -> 820ohm ->150µF. The Aikido has an extremely faint hiss that is even lower in level than the buzz of the Ref 3. The combination of 6N1P in gain stage and 6N6P in buffer stage produces a perfect combination here. Total we have 11 contenders today. After a bit of musing, and an email from John Broskie, I have decided to go for the Aikido octal-tube preamp. I have some Akido line stage kits that I have yet to assemble. Project Author. Nov 12, 2023 · It was that preamp that really got me going on the Aikido circuit, and my friend absolutely loves his. Technical data. Conrad-Johnson PV-5 preamplifier. The gain of the Aikido is 1/2 the mu of the input tube, so for the E80CC, roughly 27/2=13. RIAA deviation : less than +/- 0,3 dB. Are all four diodes to be used for the CT configuration, or only two? Jun 4, 2004 · The mic preamp's input impedance should preferable be greater than the microphone output impedance for best noise performance and frequency response. Good enough to go on a display shelve. Website says the order should be filled in 2-3 days. 9. -to large charging spikes caused by oversized transformers or oversized filter caps. 25 (1+ [R6 + R7]/R5) So with R5 being specced at 249 Ohm, 1. I have removed all the cool relay switching circuits, B+ delay and just have a direct input and output. The tubes are E88CC. You need a power supply for the B+ and the heaters. 0/5. The R-sense and 6BX7 cathode resistors values were calculated using the complex formula from a write-up by John Broskie on his excellent TubeCad. Jun 10, 2012 · Product type: Preamplifier/Processor Aikido Phono2. Abacus Aikido Preamp with remote [Expired] for sale is a custom made Abacus Akido preamplifier. I've definitely come across the Schiit Freya+. The gain was very high. Joined: 04 Jun 2008, 20:59. May 23, 2009 · Joined 2008. Kupjeno na Aliexpress-u prerađeno na napajanje od 220VDC i skutijano. Tubed preamplifiers have a well-earned reputation as system busters. Outboard power supply for ultra quiet operation. I have used this volume control to limit the signal to my my RH84 (an EL84 SE tube amplifier) before I built this preamp. Some customization is also available, such as adding a TAPE/SOURCE or Stereo/Mono switch, and changing the wording on the source selector switch. The document has moved here. 3v secondaries for heaters to the Aikido and after its regulation, the heaters are only seeing 5vdc. 3) Class II electrical safety compliance (double insulated form user) 4) Complete the project within 80 man hours. completely separate power supplies for each channel). The tube compliment is 6N1P-EV and 6N6P pairs that are ideal for low noise and low output impedance operation. 45A) and the 2 ECC88s in series (at 0. 5) A project even a 12year old can complete. If you need to support a MC cartridge, you will probably need a MC step-up transformer as well. 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. The 6GM8 (6N27 / ECC86) tube is perfect for this low voltage application - 24 volts B+. Average. You could drop in another tube like the 6922 or 6DJ8 (do not put in a 12AU7, you Jun 13, 2019 · Or, you can make use of this helpfully supplied formula: Vout = 1. Technical details: Custom power transformer - dual 115V primary (could be rewired for 240V mains), 250V Jul 6, 2008 · The Aikido Blind Test session at Tubelover, South Jakarta, Indonesia. So. I am using an HV Aikido with 6CG7/6H30, B+ 200V, regulated DC-heaters and output transformers. In my setup with a pair of NCore NC400 the volume dial rarely goes past 11 O'Clock. AIKIDO preamplifier sa 6N3P/5670 lampama. A setup of an aikido amp as driver for a SE penthode or triode looks like a graet idea. 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. But I have 2 secondaries. The preamp has the John Broskie Aikido tube preamp PCB - the LV Aikido circuit (low voltage). I liked it so much I bought my own board and assembled one in a not very nice case. Those other low-voltage triodes are just that. 12V trigger output. Oct 4, 2012 · Hi, I have aikido preamp and I would like to measure its output impedance. The preamp is based on the John Broskie Aikido tube preamp Circuit - specifically the LV Aikido circuit (low voltage). #12. I'm in the market for a new preamp. 2010-10-20 12:52 am. 3 transformer. The preamp was designed to be as general and setup-friendly as possible. Sep 5, 2022 · WTB Aikido preamp pcb or kit. It is the best looking and sounding Aikido preamplifier that I’ve built. Jul 20, 2008 · Yaho, the coupling capacitor value in Aikido circuit is based on the load impedance and the cutoff frequency you prefer. $119. In the aikido-pdf there is a power supply with a choke. The B+ Found. #3. I cannot find 12sn7s available, but have been able to find 6sn7 tubes. Mar 8, 2024 · gofar99. FOR SALE : The legendary Dynaco PAS-3 Tube Preamp, absolutely pristine, musically sweet, and just serviced. 1 x 6. I'll look up the post you referenced. But there is a very narrow window. 20VA with second hand of 13 16Vac for power supply heater tube and other transformer Tr2 of 4 6VA the second hand of 12Vac. Member. . Jan 8, 2016 · Subscriber. Sep 1, 2023 · So you have to find capacitors values which, when placed in parallel, make up the values shown in the table. 30 sec start-up output mute for safe operation with solid state power amps. The result is an absolutely amazing sounding line preamp with just the right amount of bass and treble. This unit absolutely demolished the Promitheus Apollo pre I used to own. Location: Arizona, USA. However the kit itself came with the 5A LD1084. 1 Jul 21, 2017 · Napisano Jul 21, 2017. don't use C8 at all) then you need 0. I've decided to stick with solid state. 2) All components must be from my junk pile. Similar tubes to the 12DU7 are 12DK7, 12DL8, 12DS7, 12DU7, 12DV7, 12DV8, and the 12K5 (no diodes). It really depends on how much gain you need; a gain of 13. Jul 20, 2008 · Search titles only By: Search Advanced search… 18 April 2015. #13. I don't need a phono stage etc. 084uF AJT, do you have a cutoff of using older caps or parts? Jan 2, 2022 · My plan is to build a fully-balanced line-stage preamp with the following features: Dual mono design (i. 2) Within 100x100mm to take advantage of the JLCpcb special. Thread starter Bryguy; Start date 2022-09-05 5:30 am; Wanted to buy Jump to Latest Bryguy. Answer: 6. 25 (1+ [20000+22000]/249) = 212 if I'm adding the 1 at the correct point. Tube Preamplifiers. $39. Where so many go wrong is by adding more ground wires than are needed. I'd be more curious about the Octal CCDA. $520 plus shipping. Mar 11, 2018 · The new Rev. If you have a scope, I'd start probing around. Jul 20, 2008 · Building a Aikido preamplifier. 25V (3A), and 0-5. Hi Everyone, That is my next possibility. Joined 2009. New PS-25 Bipolar Power Supply I have needed something like the new PS-25 for a long time. Može da radi i sa 6N23P (E88CC) uz upotrebu adaptera (to je baš na slikama). 3) Separate PSU for maximum flexibility in chassis layout, also the JLCpcb thing. pdf article (attached), and it is excellent. Mar 18, 2016 · The push-pull Aikido circuit is based on the schematic shown on Bob Prangnell’s Mad Scientist Audio web site in the DIY section. R2R relay switched attenuator with 256 0. $695. Remote controls on/off, volume, input selection. Feb 23, 2018 · This preamp uses the so-called Aikido cathode follower, whose output impedance can be approximated by the formula 1/gm + Rk. I would start with the R values for the 12AU7 or 6085 and experiment from Mar 4, 2013 · Speakerfixer. 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 Hello: For your consideration a terrific custom built 6SN7 Aikido Tube preamplifier. Jan 25, 2016 · Description. I think your line about signal grounding being an art is appropriate. 5) Glassware PS-21 Power supply made for this application. Gain : 42 dB at 1kHz. In the case of the Aikido circuit above, the input impedance is set by the 100K resistor across the input (in parallel with the tube grid, but we can use 100K for ballpark stuff). I'd be looking at lead dress and the physical location of power supply decoupling. Works great, no noise, no hum. Also wanted to try an octal preamp. May 12, 2020 · 1) Mono board for maximum flexibility in chassis layout. 1uF for C7||C8 (i. The 12AX7, with the lowest transconductance (gm) of the 12A*7 family, is the worst tube to use as a cathode follower but even with that, the output impedance will be about 1800 ohms. takes about 3 weeks from order to ship date for full kit or full assembled. Initially I modified one for a friend. You have to do that yourself. Aikido Phono preamp, Rev. This can cause radio pick up of those spikes anywhere in the circuit and is very difficult to solve. Mark. 0343uF for C9||C10, although you also need to subtract the Miller capacitance which is about 150pF for a 12AT7, so call Jul 20, 2008 · I have a Squeezebox music-player with integrated volume control. Aikido Hybrid Amplifiers. Jul 17, 2008 · Joined 2007. But: Let's say I made a bad connection (no contact) between ground and chassiss. 2008-07-18 3:40 am. Jul 6, 2008 · The Aikido Blind Test session at Tubelover, South Jakarta, Indonesia. 4A heater current per board, but there may be other tubes which are even higher. I am using 6SN7 output tubes. Highest quality Kiwame, Dale, Allen Bradley, and TDK CM2 resistors; Wima, ERO Jan 26, 2023 · For Sale: Abacus Audio Aikido Tube Preamp. Sep 24, 2011 · 1) Quality finishing & Aesthetically appealing. In other words, the Aikido Jul 13, 2014 · I chose the 6SN7as I like the sound, gain is about right and I have a bunch of them. Resistor R12 on each side of the Aikido board would then drop the incoming 210V to the 180V specified for each channel. com web site. The actual wiring layout is simple enough. Posted: 01 Nov 2008, 14:30. I took it to a friend's house who review's equipment and has a lot of gear. My budget would be about $1,500. It holds two Aikido gain stages per channel and uses a passive RIAA equalization network in between the two. The latter connect with PRIMARAR the first secondary transformer of 15Vac, so that otherwise get around 220V. 0. I use 6N1P and 6N6P tubes and 5U4C as rectifier. 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. You can get them as cheap as $2 each for recent production (80's) or $5 each for 1960's tubes made in the Foton plant in Tashkent. I put it in my secondary system and can not stop listening to it - it gives that air and detail to the Jan 26, 2023 · Abacus Audio Aikido Tube Preamp. A passive equalization network could easily be nestled in between two Aikido gain stages. Some use the original PCB ordered from here and some prefer their own point-to-point design. I have since rebuilt that using p-to-p wiring, a Neurochrome Maida board for the high-voltage supply and a 6 volt regulator board for the filaments. Aikido preamp output impedance of preamplifier. The 6CG7 is a more linear tube, and is more forgiving of improper or marginal operating points. 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. 4 E80CC's would work great in an Aikido line amp. That was 6 days ago. As-is, but guaranteed to work as decribed. 5. - All four stages (input & output stage for each stereo channel) are then brought to one point (star ground point?). This Akido preamp sounds very good and it would be hard to find a better sounding preamp at this price point. my amp has 47K input impedance and I want a cutoff of 40Hz, the formula is : cap = 159155 / freq / resistance cap = 159155 / 40 / 47000 cap = 0. The other area in which the Aikido betters the Ref 3 is the cost of re-tubing. Jan 26, 2024 · I must have mis-typed. #1. High voltage one sounds great, haven't heard a low voltage one, and the tubes are in good supply. Dec 19, 2016 · 2018-03-07 9:42 pm. Joined 2022. Granted the Aikido has a capacitor on the output which blocks DC from getting to the power amplifiers input and some SS power amplifiers have a cap on the input whose function is to block DC. Jul 20, 2008 · The power supply is built by parts I already had at home. Mar 18, 2009 · 2009-03-26 6:53 pm. What makes it interesting are three features: a class-A output stage and a wonderful PSRR and a free heater power supply. 3v - 6. The Aikido can be done for about $100, the Ref 3, closer to $500. 00: WI Oct 06, 2022: 3 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 29, 2013 · Use 2 a transformer, Tr1 of 15 . 3 line inputs, 1 pre-out, no phono stage, no remote. Research Pricing. keith. TX. Wonderful Aikido tube preamplifier, based on John Broskie Aikido schematic. 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. Note: The PS-21 board silkscreen and manual specify the regulator as the LD1085, which is only a 3A part. 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. Aug 4, 2013 · Specified after purchase. 6 V going to the 4 tubes on the Aikido main. It also has a remote volume control and I will include an extra pair of a 6n6p tubes. Posts: 4681. Nov 15, 2021 · Just finished a new project. Unlike wearing a belt and suspenders, adding more ground wire makes things less secure, not more. Jul 20, 2008 · Buzzing usually has two sources. However, I breadboarded the 6CG7 / 6FQ7 circuit shown in this Glassware . Master Volume May 19, 2013 · Wonderful Aikido tube preamplifier, based on John Broskie Aikido schematic. BW, Thanks for that informational post, and your naked honesty. B The Aikido PH-1 returns—and yes, it has been a long, long time. High - End preamplifier with passive equalizer network for MM and high level MC systems Input impedance and capacitance adjustable Amplifier with low noise field effect transistors. 3-0-6. This is the last Aikido preamplifier I built and kept Jul 20, 2008 · The Aikido feeds PSU noise into the unused triode to null the noise, but it only works for LF 50/60/100/120Hz and does nothing for 50kHz SMPS anyway. Both the the Aikido-LV and Aikido 12Vac PCB are in a new revision. Aikido Phono Preamp . Jul 20, 2008 · There should be at least a 1k stopper on each and every grid, and tight by the pins. Found a link on the web about reducing the game of the Aikido board. The front panel has a sub-panel holding the volume control potentiometer (ALPS RK27) and the bearing for the extended switch shaft. The 12DU7 is the only one on your list that is a true space-charge tube and the only one that could actually run a next-stage load. Ella is an Aikido classic line preamplifier designed around four 6SN7 tubes. May 19, 2013 · FOR SALE: Glassware Aikido Tube Phono Preamp, Hugely Flexible/Versatile, Ex Parts, Ex Design, Ex Sound, Factor: Phono Preamplifiers: $685. Ella. Jan 01, 2024. I know it has a good reputation so maybe the move would be sideways, but an octal Aikido is, for my money, pretty hard to beat for sheer musical enjoyment. I am leaning towards a hybrid or tube preamp. So I load the preamp with 15k resistor, generate 300Hz sinewave. B. Experiments in Tube Rolling: Nov 1, 2023 · DEALER AD : Convergent Audio Technology Renaissance Black Path Extreme with Phono Tube Preamp with recent Factor. 5 is reasonable for a line stage. I sent an email but no response. Some of the features are listed below: 6 selectable inputs, all with switched grounds to avoid ground loops. The best are 1578 Melz tubes with metal base, they range from $80-150 a pair on ebay depending on the particulars too rich for me. 365A Jun 13, 2019 · I actually ordered the PH-2 ( Aikido PH-2 Phono Stage ) board from GlassWare Audio so I could start looking over, and planning things awhile. The aikido gives a direct and accuraat sound and together with its low output impedance it should be a perfect match with a hugh power tube like the GM70, or maybe KT88 or 807 parallel SE. For example, if you choose 0. A normal simple CRCRC-supply! 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. Jul 20, 2008 · Search titles only By: Search Advanced search… Jul 20, 2008 · Think I've got it. . May 7, 2007 · The Aikido needs to be on and stable before switching on a SS power amplifier. Preamp has two pairs of switchable single ended inputs and one pair of outputs. I've choosen the Aikido Mono 9 pin pcb its also my first valve preamp kit. May 1, 2020 · All connections are made by teflon insulated, sliver plated copper wire. 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. The secondary is 300V-CT-300V (100mA), 3. Highest quality parts were used - Kiwame, Allen Nov 1, 2023 · The unit was built with the following: 1) Manley Labs RCA jacks. a 4 tube line stage only preamp, 4 inputs, 1 output, remote control input and volume !! Our newest preamp, a real bargain, better than many I've seen for over $800 !! SP10 preamp, fully assembled & tested, with remote control. 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. 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 This is essentially a $3000-$4000+ commercial preamp built for $2000-2500. Nov 2, 2006 · 12AX7s in an Aikido. Oct 4, 2008 · The primary is 0-220V. I bought an assembled line stage and phono preamp board with some accessories. The buzz can’t be heard at all from about 2 inches away. Abacus Aikido tube preamplifier with remote. 6v so I purchased a 6. 25V-CT-3. I'll order a single stereo board and get going with the project. Read in Dutch. In other words, four Aikido gain stages Jun 13, 2019 · If you use the octal Aikido board and (for example) 6SN7 tubes, that will add up to 2. However run correctly, the 12AU7 can also give surprising performance. 5db steps. Kompletan projekat sa šemama. The line stage circuit is from one of Broskie's TubeCad blogs. 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: 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). Mar 4, 2013. Subscriber. If you don't, I'd buy/beg/borrow one. I've built a similar design, but without the voltage regulator/current source, with a 12BH7 and/or 6CG7 (BTW, the 6CG7 is functionally identical except for basing, to the 6SN7), and it sounded wonderful in several cases. uses four 12AU7 tubes. The sub-panel allows hiding the bottoms of the knobs inside the front panel for a more professional look. PS-25. 3 XLR and 1 RCA input (I use XLR almost exclusively) with relay switching. The “giant” 6N6P. Presently I am listening to the Aikido using the 6DJ8 tubes. The formula calculated 790 ohms for R-sense and 107 ohms Sep 15, 2022 · This new board combines the B+ tube rectifier and filter caps, DC filament supply, and a balanced differential line stage. 00. Description. 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. It doesn't look like he ever turned this into a Glassware kit, but the design looks sound and simulates well in LTSpice. 3) Obbligato copper output caps 600V. There were some mistakes on the board which I discovered and corrected. 4) Special connections to allow tube access to be easier for the owner. 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. Feb 10, 2005 · 100+ Head-Fier. I connect the heater bias point to the centre point of the 2 resistors which are soldered between the hot and neutral cables of the secondary. All with John Broskie Aikido Pre-Amplifier design. Bas can supply you with the power supply board. Though this is one large amp weighing in at a quarter ton it is the best out of 5 headphone amps that I own Wonderful Aikido tube preamplifier, based on John Broskie Aikido schematic. 5. #11. 240Vac for voltage + B node tube. Although they would never fit on the printed circuit board (PCB), 211 and 845 triodes could be used to make an Aikido amplifier. 3Vac secondaries. Do I connect Preamplifier has zero gain and serves as a tube buffer with constant input (high) - output (low) impedance which is perfect for use with modern sources and amplifiers. 2022-09-05 5:30 am #1 Jul 4, 2016 · Custom Aikido tube preamp built by Blair Chapman. $16500. The PS-25 is a low-voltage, bipolar, voltage-regulated power-supply that is powered by a single secondary AC voltage, such as a 12Vac wallwart transformer or a regular power transformer secondary winding. Various tubes are here, small 9 pin tubes, Octal, and also the miniature like 6111WA and 6021. Jul 20, 2008 · Me: -But after the transformer I am separated from earth, and it's less dangerous Renron -Not only the A/C but how about the B+??? If the B+ gets in contact with my chassis the fuse will blow immideatly. 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 depends on how each tube type is implemented in the circuit. I am using tubes that require 12. E PCB is the same size as the older Aikido stereo noval PCBs, but the tubes are located farther apart. The only thing I dont like about the aikido is the addtional tube count so I went with the CCDA circuit for this one. e. #2. Cond. The only Aikido preamp circuit I have used is the SP14. no you dont need another circuit for the volume control, you just need a pot. Sep 18, 2016 · Average. Oct 30, 2014 · 2014-10-30 10:57 pm. There, you will certainly need the gain. 5) At least 50mm spacing for coupling caps for flexibility. 6CG7/ECC99 Aikido amplifier biased hot to allow plenty of drive for higher-impedance headphones. Working very well with my Cary PP 300b amp. Preamp has two pairs of inputs and a pair of outputs. I started my preamp project searching for an excellent and reasonably priced kit and found almost universal acclaim for John Broskie's circuits. 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. I would be pairing it with class D balanced mono-blocks, driving 4 ohm nominal speakers, and my main source would be my DAC. If it is this it will appear as a small spike on the leading edge of the residual PS hum. ielselnfoqavoadobdfb