Aikido line stage specs. It was a nightmare to get it the way I wanted.

Aikido line stage specs 5 and 7. com, is an excellent way to start. i have an aikido octal, noval and 12V in the cuereally im not sure what to start with. My first was a Tubes4hifi. And I have finally built one, as shown above. It sounded very good and dead quiet. Nov 15, 2008 · I measured AC current in my Aikido stage and was very suprised of the result: 4,2 A (AC)!!! I use 6N6P in both position. I had a slight hum through the phono stage at max volume. The best way to determine this is experimentally. Note the way the boards are assembled. It sounds good and is dead quiet. il likely start with the aikido octal, as im finishing up 2 organ amp rebuilds and a DG SE-1 scratch build. 2 24V Aikido Stereo Line-Stage/Headphone Amplifier PCB PCB Overview Thank you for your purchase of the TCJ24V Aikido stereo PCB, Rev -A. I wanted to use the valve pre-amp with a good SS power amp. 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. I used to have an Aiyima T7 preamplifier with WE396A tubes instead of the Elekit. Is the Aikido a real high end performer or just something worth experimenting if you have the time and money? thanks. Mar 11, 2018 · New Aikido Stereo Noval PCB . The single ground from the small board on the volume control should be ok, but I would split it so it connects to both R and L ground on the line stage board. Can't wait to hear more abou Sep 5, 2007 · Hi, What S. It's made by CineMag, model CMLI-15/15B. Wired on turret boards in a bespoke chassis, with a stepped attenuator, regulated filaments and B+, Mundorf Supreme output caps, and a combination Jan 23, 2009 · for the Aikido Line Stage Kit Bottlehead Foreplay II and Paramours; DIYHIFISupply Ella; Hagerman Cornet2, Clarinet, and Piccolo; Cinemag switchable SUT; Audio Note Kits Amp One. 3 This is for an Aikido line stage/headphone amp. 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. Any body? I have pretty good listening time with a 4 X 12AU7 Aikido build by Blair Chapman. So I have decided to remove the boards and build this: AC Mains Line Power Filter LPF-6000 – ATL Audio Ltd. I built a preamp using Erhard's like stage and power supply boards. Now adjust that trimmer. Spec. Also all the AC wiring was twisted. specs: prim I know this from first-ear experience, as my own Aikido line-stage amplifier runs with four 12SX7s (GE) and it sounds fabulous. Jan 11, 2022 · Tubes4hifi and Erhard Audio sell line stage and power supply boards along with complete kits. Where the typical tube-based line-stage amplifier requires a B+ of 200V to 400V, the Aikido 12Vac can get by with only a B+ voltage of 100Vdc with 6DJ8/6922/E88CC tubes; or 130Vdc with 12AU7/ECC82/ECC802 tubes. I decided that the project itself would be modelled on the VTA style, as there was not much sense to me to reinvent the wheel. If somehow you don't know what the Aikido circuit is, say Google dumped you here for the first time, the quick answer is that the Aikido tube circuit provides low distortion, low output impedance, and stellar PSRR (power supply rejection ratio)—all Jun 13, 2019 · John Broskie, designer of the Aikido circuit, essentially did this very thing with the ACF (Aikido Cathode Follower) and it was in that manual that I found the answer. New: The All-in-One Line-Stage/Headphone Amplifier The original Aikido All-in-One design combined a 9-pin Aikido line stage amplifier and high-voltage B+ power supply and a regulated low-voltage heater power supply on one PCB, thereby greatly reducing the stress level of many Aikido fanciers. It turned out nice. Member. This circuit is designed mainly for maximum PSRR, but the gain is way too high for line sources, especially if used with efficient speakers. Aug 30, 2013 · Hi guy's now that I have completed construction of the boards I thought I would post some pics of my new line-stage : The chassis and volume control/switch matrix are on their way. I'm planning to build an Aikido line stage amp. As you probably guessed it is Dave and I who have the two amps configured this way. Configuring the Aikido this way does put that extra capacitor in the signal path however. I will go with a 6. Aikido fixed gain linestage to use as voltage gain for PassDIY F4. I put together a couple of mono Aikido line stage boards from John Broskie to use as a voltage gain stage for the PassDIY F4 I just finished. here the schematic : Hm - I see YOur point - it is a problem to calculate this. It’s been almost two years since I first wrote about building an Aikido line stage amplifier based on the low-plate-voltage, dual-triode tube, the 6GM8 (AKA ECC86 and 6N27P). It's been a fun project. 4-3 12VAC 5. The boars kit was around $40. com SP14 kit which I have absolutely loved the sound of Jan 16, 2005 · This means that an additional gain stage will be needed, as even a 12AX7 will only give a gain of 50, which in turn is divided by the output transformer’s winding ratio. I would like to get the gain lower, around 6. Jan 23, 2009 · My good friend Steve Brown provided a schematic for me to build mine with a $60 Hammond 370BX power transformer which yielded 350 vDC B+. $9. You pay for it with 3dB worse signal to noise ratio, but you probably won't notice this in a line stage. With R4 = 330R the first stage gain is 8. 5" x 3-11/16". I still have to get the power plugs and sockets to go between the psu and linestage and I realised last night that I Feb 23, 2018 · the first version he is referring to is the Aikido line preamp PAS upgrade kit we sell using 12AX7's, an earlier version of this kit used the 12AU7. Aug 28, 2024 · the aikido phono is 2 line stages with RIAA between em. Look at the output on a scope. Joined 2006. From Wall Of Sound : "This Russian-made tube comes hard on the heels of the Reflector 6H23p-EB. Maybe post some pictures of the inside. Dec 8, 2019 · In two words: darn good. In fact, a stereo Aikido line stage can be made from just three tubes. Aikido Noval Rev. given using same components, same tubes, same system setup. The line output attaches to the Aikido’s cathode follower output stage via coupling capacitor C1. I've got a couple of remote volume controls to try. Swapped in better caps with the correct orientation and believe it or not, it's dead quiet and actually sounds pretty good. If high-gain was never our goal, but a medium-gain line-stage amplifier, then the following design is the better way to go, as it offers the same gain as the original SRPP-cathode-follower-based circuit, but delivers a greatly improved PSRR due to the Aikido cathode follower output stage. Firstly a bit of background as this is not my first rodeo with the Aikido. Jun 13, 2019 · Must be 15 years ago that I came across John's then new Aikido design and I built the octal dual mono design. Jan 27, 2008 · The new Aikido board offers two output stage: a line level output and a headphone driver output. Jan 8, 2016 · If you want to build an octal Aikido line stage, a fellow on DIYaudio has designed a mono board and posted the Gerber files so you can order them from the PC board fab of your choice. To find a transformer current value do I just add these 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. In the classic Aikido line-stage amplifier, the input stage consists of a grounded-cathode amplifier with an active load, the load being the same triode and the same cathode resistor value. The heaters are all placed in series and this heater string is powered by a portion of the the B+ power-supply voltage, the bottom portion. When we look at the plate curves we see that for 110V on a plate and Jan 9, 2012 · Each PCB holds two Aikido line-stage amplifiers; thus, one board is all that is needed for stereo unbalanced use (or one board for one channel of balanced amplification). By including the necessary components for the heater and high voltage B+ power supplies on the PCB, the5687 All in One board makes building a standard-setting line stage Apr 11, 2007 · Try this experiment: Take an Aikido line stage and rejigger the cancellation resistor string to have a trimmer in the middle, adjustable 10-20% on each side of the calculated null point. My Own Aikido 12Vac Line Stage The Aikido 12Vac board holds stereo Aikido line amplifiers. Aug 16, 2010 · The key advantage of the LV Aikido is that it can operate under relatively low B+ voltage. All Activity; My Activity Streams Mar 26, 2019 · And the grounds for the input Jack's are not tied together. Basically, no info at all. Jul 11, 2005 · Thank you for the information. I am VERY happy with the sound, especially as today I installed Telefunken 12AX7 and Amperex 12AT7 in the phono stage and Bugle Boys in the line stage. BuzzK Jul 16, 2009 · Specs. May 21, 2024 · Aikido as EL34 driver stage - good results using PCC88 for the input tube (R3,4 = 220r) and ECC82 (R6,7 560r) for the output. S. So your question 'which Aikido Line Stage' is nonsensical in the context in which it is presented. Hat's off to you, especially as a beginner for executing such a technically advanced build, elegantly completed. All of the circuits could provide the characteristics you describe, depending on on how they are Jul 29, 2024 · 300B seems entirely overkill for a preamp. Power supply is a recycled Modwright external supply Aikido Line Stage Amplifier Kit (octal-based & stereo). ) This circuit eliminates power-supply noise from the output, by injecting the same amount of PS noise at the top and bottom of the two-tube cathode follower circuit. Dave Apr 20, 2017 · The interconnects between amp and line stage will connect the line stage to ground. The input tubes running a little bit harder than the second stage (Rk= 220 ohm and 430 ohm). Joined 2007. The circuit is textbook Aikido (not that any textbook holds the Aikido topology). The result is that the two triodes define a two-resistor voltage divider that halves the power-supply noise at its output. Jul 26, 2008 · Funny you should say. Mar 26, 2019 · The Aikido I built used a dual regulated supply that cost a bit of $$. Even with a raw B+ voltage of 330Vdc, the dissipation is only 6. Connect a very ripply supply, maybe a volt or two worth. The line stage is very quiet. broskie has also offered a tetra phono with or without the power supply. While I had the tubes, the Aikido PCBs, the supporting parts, the design, and the desire, somehow I just never had the time. Would splitting up the first stage plate resistor (R4) and making it a split Aug 18, 2013 · The line stage has way more gain than necessary. Rated fastest 40’ stage for set up and tear down throughout the industry. 6 inches, and mounts identical to the original board. Is that the "H+"? Also not sure what are the 6. 134 VDC w/ aikido 54 VDC 7. They are mono octal boards requiring separate B+ and filament Jun 19, 2008 · Hi all, I'm trying to design a PS for my new Aikido line stage. The model Ella is one of my custom built Aikido line preamp using the 6SN7 family of tubes. Found a link on the web about reducing the game of the Aikido board. Balanced Aikido It looks like an octal, stereo Aikido line-stage amplifier, but it’s not. Jan 8, 2016 · Has anyone heard or built an Aikido line stage? I see several different flavors using 9 pins and or octals. Nov 15, 2021 · Just finished a new project. My friend and I met and discussed the layout and chassis. In Reply to: Aikido Line Stage posted by manualblock on May 13, 2006 at 13:52:55: Man, that's cool. Where the typical tube-based line-stage amplifier requires a B+ of 200V to 400V, the LV Aikido can get by with only 24Vdc with 6GM8/6N27P/ECC86 tubes; or 48Vdc with 12BH7 or ECC99. PSU is 375V 150mA transformer, 5Z4 rectified with plenty of capacitance and a 20H choke. Each channel is seperatly tube regulated using 2x0D3 and 2x0C3 giving 265V per amp. Mar 26, 2019 · I've built three cheapie Chinese "clone-type" line stage kits recently. This isn't mentioned under Aikido 12Vac Aikido Line-Stage Amplifiers Aikido Noval Stereo Aikido Octal Stereo PCB Attenuators and Signal Selecters Attn-1 Stepped Attenuator Attn-12 Stepped Attenuator Attn-2 Stepped Attenuator Attn-Ladder Stepped Attenuator Audio Gadgets Balance Trim Balanced to unbalanced Capacitors and Sockets Cathode-Coupled Amplifier Cathode-Coupled Jan 4, 2021 · Yes, that's right. Dec 11, 2023 · Below is the stock Aikido linestage circuit topology. 00 each, plus exact postage. So here it is: the Aikido Amplifier. B+ = 200 V DC (Bas powersupply) Jun 13, 2019 · This new board combines the B+ tube rectifier and filter caps, DC filament supply, and a balanced differential line stage. Thanks and Cheers! Mar 29, 2013 · For sale: Original, unused octal Aikido line stage pcb plus 2 chokes (10 and 5 Henry) and power ei-core power tansformer from ae-europe. Go to the Dale, Vishey or Welvyn webpage and study the spec sheets. 374 VDC w/aikido . I am not sure what the heater bias point is on the Aikido PCB. 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. 08 May 2009. Feb 24, 2011 · Hi, has anyone built both the Aikido Line Stage(could be All in One) and the A. 2006-08-17 5:09 pm #9 2006-08-17 5:09 pm #9 Each PCB holds two cathode-coupled line-stage amplifiers; thus, one board is all that is needed for stereo unbalanced use (or one board for one channel of balanced amplification). Thanks, SteveA So here it is: the Aikido Amplifier. Tubes4hifi power supplies use tube rectifiers, and Erhard uses SS. It doesn't look like he ever turned this into a Glassware kit, but the design looks sound and simulates well in LTSpice. tetra topology is diff from the aikido circuit: ATM i cant recall the tetra topology, but he does offer a similar topology in another non-aikido line stage. 9. I have heard good things about GlassWare kits and their performance. 6CG7's provide about 20dB. So are CCDA, SRPP and Cathode follower (I assume that is what you meant). I am a bit ignorant of these things though. Introducing the new Aikido 12Vac PCB and part kits. 43 VDC H+ to H- is measuring 15vdc Sep 21, 2015 · 1x Glass-ware/tubecad Aikido 9pin 2009 revD Partially stuffed and soldered for 6n1p wire tie pads attached for large output caps. Maybe you get an inspiration. The amplifier circuit is a point to point wired version based on the All-In-One board that I used for my headphone amp (see my previous post). NC 6. Ratio = 1/mu + ½ according to tubecad. Just me, but if i were after a low mu triode for a preamp it would be some other tube. (Since it could form the foundation of a phono preamp or a tube-based headphone amplifier, "Line" has been dropped from its original title. The CCDA is like an "Aikido light" with 1/2 the tube set. This version used four 12AU7's for the line stage. Oct 31, 2023 · Looking for opinions from people who have built or heard them both. primary: 110-120 secondary: 220-240 filament 1: 12. Sep 11, 2005 · Hi, I have just finished and tested 2 aikido amplifiers using 12AX7's in gain stage and 12AT7's in buffer. Over the past 8 years, I've built, re-built, modified and loved them all. 2009-01-14 8:56 pm #194 Aikido Line Stage. Feb 23, 2018 · Some time back I buit an Aikido line stage with a phono stage in a reproduction PAS chassis. The transformer should be fine since the secondary winding is as you say. Want dual filaments so that it would be easy to switch between multiple tubes. Jul 21, 2017 · Although the new PSU will support the original PAS phono and line stages, it simply runs out of gas when you go from 2 x 12AX7 to the 2 x 12AU7s that his upgraded line stage is designed for. I bought the two boards and power supply from then Tubes Nirvana. because if You calculate the current according to ohm's law You get 2. ma_coule. beetel. Mar 6, 2019 · I used about 160 volts on an Aikido line stage built around all 6DJ8s. On the output side of the line stage, my usual ARC Ref 110 and PSB T8’s handled power amplification and loudspeaking duties. After realizing the error, the seller has offered to send me one of his larger regulated power supplies (that can support the higher current) -- the same Jan 20, 2020 · Looking at the jumpers on the audio boards, the filiments are wired in series. R. I bought an assembled line stage and phono preamp board with some accessories. If you are just doing the line stage, the grounding issues become simpler. Nov 25, 2014 · When the aikido was connected all tubes lit up, but that's only because (I assume) that the h+ and H- are correct. I think it was actually a post somewhere from JoshK that put this idea in my head, so I researched it and came up with enough parts to build one this weekend (thanks Josh!). As far as I know, no commercially-offered, unity-gain, tube-based line-stage buffer exists. Posted: 10 Sep 2009 7:14 pm . Haven't found any valve suppliers yet here in Uruguay. Tubes used in Jul 11, 2005 · What is the ratio you used on the second resistive divider? It should be 56% not 50% not sure what the Mu is of the 6n6p I'm assuming 15. Jan 8, 2016 · Broskie's "All in One" Phono section and his "All in One Aikido Line stage" are too big to fit into my chassis, so I am going to use the regulators and power supply from the phono PCB to power the Aikido stand-alone line stage. I know that 6N6P is a "thirsty" tube. A look at the ECC99 data sheet suggests to me that the 150-0-150 winding of Hammond a 369BX power trafo bridge rectified (end to end) by 4X Schottky diodes and choke I/P filtered would make a satisfactory bipolar PSU. 6 x 3. I have the Raleigh Audio line stage which has 8dB gain. So here it is: the Aikido Amplifier. My (first of many) question is this: JB's 6SN7 specs with a 300V B+ and cathode resistor values of 1k/input 470/output state current draw to be 4. 5W Mil. I honestly can't say the TFKs do anything remarkably better. Jan 23, 2009 · for the Aikido Line Stage Kit Bottlehead Foreplay II and Paramours; DIYHIFISupply Ella; Hagerman Cornet2, Clarinet, and Piccolo; Cinemag switchable SUT; Audio Note Kits Amp One. If you use Broskies PS-1 supply the voltage is set by selecting a resistor from among the ones supplied with the kit. Sep 29, 2007 · The advantage of using cascoded SS device CCSes as loads is a HIGH AC impedance, without I 2 R heating losses. I will be building this design with a B+ of 300V and 12AU7 tubes. The only hum I have is a. Nc 3. 4A or 400mA. If I were building a new line-stage amplifier with this PCB, I would forgo the cool-looking tubes protruding trough the chassis for the simpler arrangement of having all the parts sit on top of the PCB and placing the Apr 18, 2017 · The Aikido/Elekit/KT77 combination got darn close to the Aikido/Eiclone/KT120 combo described above but in some respects I think the KT77 was slightly better. 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. Working very well with my Cary PP 300b amp. 133 VDC w/ aikido 50VDC 2. That, in turn, promotes maximum linearity from the CF. In fact, maybe the JJs have more on top and not in a harsh way. The PCB color is now red, but the real difference is found in two major changes: each channels's B+ RC filter is made up of pure polypropylene (no electrolytic) capacitance and each channel gets its own separate heater power supply. Great sounding boards. . 100VA * 0. amplifier do you use with your Aikido Line Stage? I'm considering the Parasound Halo A21 and building the Aikido 6SN7 instead of the Parasound Halo P3 Preamp. This was in comparison to my two-chassis, tweaked-out Aikido line stage. the pcb was silkscreened incorrectly. Aug 25, 2010 · In a tube amplifier you need resistors that can stand a lot of voltage. I tamed the gain by swapping one of the 12ax7s for an au7. FM3 Zone had the face plate made as to what I wanted. We're planning on doing one box for the power (two transformers) with a umbilical to the other which will contain the power supply board, preamp board, and tubes. Mar 11, 2010 · Balanced-Input Aikido I have added a 1:1 input transformer to my own Aikido line-stage amplifier. Comes with the manual for 100 bucks. If the spec sheet is correct this seems like it would be plenty. 7mA (430R/1. Oct 14, 2020 · I kept all the AC wiring I could under the chassis. Then the Aikido cathode follower will null the 50% of the power-supply noise that the input stage leaks. The gain was very high. My Aikido is the bigger sibling to the more basic Aikido outlined in the line stage series from 2016. My friend did a more elegant resistor swap. It was a nightmare to get it the way I wanted. Jan 14, 2003 · The 6FQ7/6CG7 is my favorite in the Aikido line stage as an input tube. Yes: four tubes, two interstage coupling capacitors, and two output coupling capacitors—all for one channel. Here is the datasheet preface: Line Input Transformer 1 : 1 Winding Ratio - Dual Shields Optional Jun 9, 2019 · :thumbsup: i really think it's in the way its grounded. Oct 4, 2024 · I built a line stage preamp supposedly based on the Marantz model 7 line stage. There were some mistakes on the board which I discovered and corrected. 6v so the transformer is cheaper and the tube itself is also pretty cheap. Broskie suggests an outboard power supply. It offers low distortion, low output impedance, a great PSRR So here it is: the Aikido Amplifier. So, was wondering if anyone has had the opportunity to use them in a line stage application as below? If so what are your opinions or thought about this Aikido line stage? 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. 63. So the pentode provides the voltage gain and the Aikido output stage cancels a lot of the psu noise and provides plenty of drive into the output stage. I read somewhere that the R12 component from the RC filter was useless in this configuration but needed to be replaced by 100/500 ohms resistor. Haven't built with them yet. A 0. No big rush, but it is something I would like to find in the not too distant future to have as my at work tube amplifier. Feb 25, 2016 · I'm about to purchase an unbuilt Aikido Octal line stage kit, includes board and all parts to build the board along with a matched quad of RCA 12SN7 tubes. Since your building a 12v version you should be ok. Jul 31, 2011 · The only thing that I didn't like about the "Last PAS" was the line stage. Thanks. The second stage will have significantly less gain than the first stage, about x5. I'm thinking of pulling the trigger on a few boards but thought I would ask if anyone has tried one. Jun 30, 2021 · How long do tubes last while maintaining good sound both by an Aikido line stage and an ACF (Aikido Cathode Follower) ? Some guys claim, normal line stages and cathode follower haven't the advantage concerning PSRR but the advantage concerning greater insensitivity to the effects of tube aging. The bottom of the chassis, like so many other bottoms, isn't as good looking. 149. The old octal stereo PCB held over 150µF of RC capacitance per channel. 110 ] on May 13, 2006 at 22:55:07:. This FR-4 PCB is extra thick, 0. The Aikido tube topology, created by John Broskie, delivers the sonic goods. what configuration did u end up for your aikido line stage? (One day, I will build a 400V Aikido line-stage amplifier with eight 6J5 single-triode tubes, four per channel, with four low-voltage heater regulators, two per channel, one referenced to 80V, while the other is referenced to 280V. 6W, excluding the heater dissipation (another 11W or so). Jan 19, 2015 · About two years ago I machined the case work for an Aikido line stage and a year ago I finally got around to assembling it. Just trying to get the parts together. It wasnt a cheap build, but im happy with it. There just seemed to be a bit more natural, slightly clearer quality especially in the upper mid and high frequencies. He didn't have power supply boards (I used his LV-1 in my latest line stage) back then so I borrowed a schematic from a friend. What do you think of partnering a dnyakit ST-35 or ST-70 with the Aikido line stage amp? Cheers, Chris . But according to datasheets this wouldn't happen. Aug 10, 2023 · I have had an unbuilt ERHARD Audio Aikido line stage on my bench that was waiting for this problem to be solved. You aren't guaranteed 100% grounding of the line stage this way. C. Here is the schematic in basic form. The Aikido circuit may be humble but like most it needs proper implementation (see part 1 of the series). A couple of resistors and a capacitor each side was all that was going to be required. The line stage circuit is from one of Broskie's TubeCad blogs. No idea why he put that much gain into a line stage, since usually he uses gnfb, but not here. It also inverts. The filter is a simple CLC with a 100uF Solen film, a 5Henry Hammond choke and a 47uF Solen film. The AIKIDO circuit delivers the sonic goods. I've been looking closely at John Broskie's "Aikido" CF designs, and in fact I bought some PCBs from him. Tube-based buffer line stages that provide no voltage gain are, surprisingly enough, rare. Just curious if both should sound similiar or the one with gain would sound better. Joined 2003. 2 digital music player, feeding a Cambridge 840C, CD player/DAC. Jun 13, 2019 · I ordered the boards for the Aikido Noval (9-pin) line stage and complimentary PS-21 power supply, both of which come with components and instruction manual. This allowed us to get away with making an Aikido push-pull output stage, so that high-impedance headphones could be driven. 00 including shipping in CONUS Still available: Early version of Aikido Line stage like the 5687 one below but standard tubes New/unused PCB Only $18 including shipping in CONUS Feb 12, 2022 · Let me explain. Spent hours roling tubes and changing the cathod resistors as required but had the best results by far with the above combination. resistors. RockysDad. Postage: Canada - varies widely (need your postal code) USA - (Light Packet) $3. A. 3V heater supply, with the 6SN7 heaters in series. An Aikido pre-amp / line-stage. I used tube nervana dual power supply, ph10 phono board and Aikido line stage. 3-4 12 VAC 4. Below is one such amplifier. Posted by Wayne Parham [ 64. Jul 11, 2005 · In my case it just a journeya little research. Oct 20, 2010 · My Aikido/Tetra Preamp Here are a couple of photos of the finished preamp which has a Tetra phono stage and an Aikido line stage. The punch line is that just because this Aikido PP headphone amplifier was optimized to to work into a 300-ohm load doesn't mean that it won't make an exemplary line stage amplifier (and make your friend's fancy $5,000 line stage amplifier sound cheap in comparison ;). F. Tubecad. I use Dale Mil. The PS board seems to be built with the tubes on the top side and the components on the bottom Oct 3, 2005 · The pentode Aikido uses a pentode as the first stage, as shown on the link that Dave provided. Ponder that a bit. Dec 17, 2016 · The Aikido is a specific topology. 00 Worldwide - For example, an Aikido line-stage amplifier holding four 12AU7 tubes might only draw 20mA total. 6bx7 maybe, its a twin triode wirh a mu of 10, and its indirect heat which makes it a little less fussy to use. May 21, 2024 · I use the line stage of the Elekit with a 1960 Mullard 12AU7, and with that particular tube it sounds pretty good. 5 Av. I didn't measure with a dummy load or anything. See post 12 for pics $30. Jan 13, 2017 · I built one with a new pas chassis. 2 mA respectively. Nothing at all wrong with standard line stage, with tone controls, but I prefer the tone controls centered. E. 6 filament 2: 6. The datasheet says 750 mA /+-10 %, but 4200mA, wow. May 6, 2018 · Here is the schematic of one of the two Aikido line-stage amplifiers on the PCB. I was not happy with the AC line filtering boards and how they were crowding the inside of the preamp enclosure. 3V windings. No one ever said that balanced was cheap. resistor is the size of a conventional 2W metal film. Jan 31, 2016 · I just wired a noval AIKIDO preamp with 6CG7 input and 6DJ8 output. ) Still another possibility is to make a bipolar, low-voltage power supply out of the two low-voltage regulators. Sep 12, 2024 · JJ signal and power tubes are great IMHO. Overall picture, close up of the jack plate and how it's wired etc. 3V - CT - 6. Each Jack grounded at the selector board only. Jul 20, 2008 · Would the Aikido line stage be compatable with a dantimax control board controlling an alps motorpot? M. New model offers new features for large screen set up. First one I assembled blew a polarized axial capbut not my fault. The plate load of the 12AX7 is too high for driving cables and level controls. The R -core transformer was even cheaper. Jul 11, 2005 · 1-How does one make the PSUD2 picture look like the Aikido PSU V1. Attached is a jpeg of a schematic and diagram of the Oct 5, 2007 · Hi Folks, I have a pair of Aikido Linestage PCB's. 2008-07-22 10:45 am #10 Nov 3, 2016 · Thank you for your comment and interest in Wall of Sound. Going to get that built and installed this weekend. I have a stand alone phono pre and a phono and line stage all in one. Aikido Line Stage Amplifier Kit (octal-based & stereo). Iinstead, it's a single channel, balanced Aikido line-stage amplifier. 0 posted? 2-I understand that you "drew" a CRCRC supply here but the Aikido supply isn't a CRCRC is it? 3-In PSUD2, once I have the supply drawn correctly, I use C1 values to "tune" the b+ to 210V, correct? I've ordered as per Seth's BOM (ie, 1 and 2 uF parts). Everything is on one board except the power transformer, volume control and selector that you source separately. Mar 3, 2009 · Search titles only By: Search Advanced search… Thousands of events and numerous tours challenged by time and logistics are made possible with the SL320 mobile stage. The AN-1T150 datasheet shows the HV output to be 106W. The plan requires that the input triode's plate resistor split the B+ voltage (and by extension, the power-supply noise). Note how sharp the null is. A jumper from L to R ground on the line stage board will do. Aug 8, 2022 · I believe the input resistance of the CCDA line stage is 1 mega-ohm, due to the value of the first resistor shunted to ground. But build the 12Vac aikido. Aug 2, 2024 · im doin all 12AT7 for this phono amp, but im excited for the many possibilities. Still, there is no reason that two Aikido amplifiers could not be cascaded; the first as a high-gain stage, the second as a power output stage. My son is using it now that I bought an octal version. If you use the 50 VA Antek you suggest the 140 volt tap should be good for a DC output from the PS-1 in the 150 volt range, the 160 volt tap good for Mar 12, 2008 · Another thing I wanted to mention is the specs on the AnTek 1T150 torroid. The Aikido will substitute for his fully tweaked Bottlehead Foreplay-style line stage that has an expensive stepped attenuator, fairly pricey jacks, regulated power supply in a separate enclosure, some oil caps and Auricaps thrown in for good measure and other tweaks and fancy parts too numerous to mention. I guess I don't need them! Nov 24, 2014 · I came across several 5687 tubes in my stash from years back. the last one they had was ph-2. 12x4 tube I have put the readings next to each with the line aikido connected. I know with the line stage you have gain vs. Maybe if the secondaries where wrong then other specs could be wrong. I also wasn't happy that the filtering would only benefit the preamp. You still might have too connect the line stage chassis to the 3rd pin ground (or the power amp chassis). On the front there is only an input selector, volume control and rotory power switch. I want to use it with a regulated 300V PS. But I wanted new. They bumped a quad of good testing vintage Telefunken 12AX7. What I want to do is to use this as a preamp to drive my Mac MC40 amps. The CCDA has the option for using a small amount of positive feedback for more distortion. Recommended for crowds between 2 000 and 10 000 people. I’m looking for in production tubes, since I already have a matched pair NOS Siemens E88CC. My first build was a 300B amp from scratch. The first stage inverts the signal, and the 2nd stage is a 12AX7 based CF. Now that I have the AikidoI realize how much I needed to have more gain Plus the search for that magical driver stage for the 300B continuesand I would love to try the Aikido stage in that position Aug 30, 2013 · DIY Audio Projects; Activity. I bought a few and they look good. E I have a major new revision of the old Aikido stereo noval PCB, Rev. I recently swapped in a set of their ECC803 (long plate version of their 12AX7) in my Erhard Audio Aikido line stage. 2V). 6Pf / 150V = . This transformer is a fairly high impedance affair that likes to be terminated by a 15k resistance. Project info can be found at: :cop: Compromised URL removed by Moderation Each board measures 3. Don't give up. If you are tempted to try DIY the Aikido line stage as done by John Broskie, aka Mr. The Cathode-Coupled PCB makes building a standard-setting line stage amplifier a breeze. small amount in the phono stage with the volume up high. I lived in a very rural area and the power was noisy and fluctuated between 120v and 127v. This is an odd situation, as passive line-stages are popular, which proves that extra signal gain isn’t always required. The Gerber zip file is in post 20. So i goggled info about them and found this nifty line stage that people are commenting positive marks. B. Jun 11, 2014 · Slow, but we were never in a hurry anyway. The Aikido Max was the best line stage I’ve heard in my system short of the ARC Ref 3. Joined: 10 Sep 2009 9:21 am Posts: 4 Hey guys This vacuum tube features gold plated pins and is manufactured to extremely tight specifications, making it the highest quality current production E88CC/6922 available. Nov 1, 2024 · Post subject: Newb questions enclosedAikido line stage build. Resistors with a higher wattage rating can usually stand more voltage too. 094 inches (inserting and pulling tubes from their sockets won’t bend or break this board), double-sided, with plated-through 2oz copper traces, and The high-level source was my NAD 50. unity gain. Pins 1. bxbbilgw ajzlnx iykf kppdoyrq bjja opkm pjom uqzjqmr qrel qdcvtq