Aikido 12vac.
But good sound is not enough, I only now realize.
Aikido 12vac The board from Asia was a non-starter, so to keep to my original intent of offering two units, I’m letting the Aikido prototype go, too. Sometimes Broskie has a considerable gap between runs of certain kits. Aug 15, 2019 · Built an Aikido long time ago. Cheers, Steve Jul 19, 2015 · Since the 12Vac ACF (Aikido Cathode Follower) proved so popular, so popular that I quickly sold out of them, I decided to improve it further for the new PCB production run. I thought it'd be good to document the build - I expect it will proceed at a somewhat leisurely pace, but Adventures with: The Aikido 12 Volt AC kit. The Octal will limit your tube choices somewhat and require a power supply as well. This is the real beauty of this preamp. I have recapped a Pioneer SX-1050. I use an Aikido in my main system (6sn7s with a B+ of around 400v), so the thought of another Aikido for my iPod/Adcom combo could be good. Jun 11, 2014 · 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. Jan 20, 2020 · wallofsound has a build/review thread of the aikido 12vac. The 12Vac has the PS built right onto the board and all that's required is an approx. I've been using it this way for 10 years now. The Aikido Noval is out of stock. May 13, 2013 · I just received the "Aikido 12vac" board. Nice board and layout, very compact. Okay, returning to the ACF 12Vac, the power supply uses big-valued, but low-voltage capacitors in a voltage multiplying rectifier arrangement. 7K ohms and R10 of 300 Oct 5, 2015 · The Aikido 12Vac is a convenient project because the power supply is included, just add a transformer. 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 without the use of a negative Mar 27, 2019 · It’s built to be able to be run off of a 2amp 12v ac wall wart. The B+ supply to the But good sound is not enough, I only now realize. Granted it’s a bit more expensive, due mostly to the higher tube count and three transformers, but the circuit board isn’t any more complex than the 12Vac Aikido. Oct 5, 2019 · I've put together an Aikido 12VAC to use with 12AU7's, and when I bring it up to power on a Variac, the V4 tube glows bright red real quick. There’s numerous versions, but I believe they all have the same layout once you get past the power supply. Mar 26, 2019 · The Aikido I built used a dual regulated supply that cost a bit of $$. According to May 21, 2024 · Right now, your choice is the Aikido Octal or the Aikido 12Vac. That results in a value of 300X(31/35) = 265 Ohms. I’ll probably end up picking up a potted toroidal transformer when I have the time to search for an appropriate one. I just replaced parts based on the schematics and or instructions from forums. Custom enclosures of TBD design. Could be wrong on that though. The reason for a preamp is to add some tube warmth. Prev. $30 to Dec 15, 2014 · I want to build a line-stage between my iPod/iPad headphone out and an Adcom GFA-545II. Tons of info out there. Thread starter yakusa; Start date 2013-05-13 3:21 am; Status Not open for further replies. May 12, 2020 · The chassis for my Aikido, based on Broskie's original board, is a piece of Home Depot sheet steel bent into a U shape, with a separate 24v power supply based on a pre-built linear supply. (Since it could form the foundation of a phono preamp or a tube-based headphone amplifier, "Line" has been dropped from its original title. They do sound very nice, lots of gain. You should have no trouble building it. Sounds pretty good. Need to double check voltages and then get to work mounting it in the case, fabricating the front panel, and building & wiring the Nixie Aug 2, 2024 · Aikido 12Vac line stage/pre-amp build & review :thumbsup: i really think it's in the way its grounded. May 13, 2013 · Aikido 12Vac. In the build manual, it is suggested that R13 be calculated based on the following formula: R13=R10 X ((33-2)/(33+2)) . Jul 10, 2011 · Aikido 12Vac Preamp build as name suggest it needs only 12 V ac to operate. The transformer should be fine since the secondary winding is as you say. Their configuration will depend on if your tubes have 6 volt or 12 volt filaments. complete Aikido preamp kit is Tubes4hifi. The PCB is now a tad bit larger (4 by 7. My first build was a 300B amp from scratch. Troubleshooting skills in non existent. I lived in a very rural area and the power was noisy and fluctuated between 120v and 127v. There will be jumpers on the board for filament supply to the tubes. Aug 15, 2019 · First off my skills. Aug 15, 2019 · I'm in the middle of building the Aikido 12VAC preamp. Apr 14, 2024 · Re R11-13: I haven't seen all of your manual but if it's like the Aikido 12Vac line stage, the power supply schematic will be on a different page in the manual. Introducing the new Aikido 12Vac PCB and part kits. Have fun and enjoy the sound! 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, say 12Vdc. The original Earmax used two 6GM8 (ECC86) tubes for output duty and a single 12AT7 for the gain stage. If this sounds too daunting, relax, I’ll take you newbies through it step by step in a future installment. Without a name, a circuit will quickly disappear from memory (and Google). So, I was The Aikido 12Vac is a kit, and the buyer must assemble the parts to the board and solder them. I’ve read lots of glowing reviews about the aikido pre-amps, so I’m quite excited and have high hopes for the final outcome. The key advantage of the Aikido 12Vac is that it can be operated from a lowly wallwart power supply, yet develop a fairly high-voltage B+ for the triodes. Don't give up. But the recommended value of R13 is 88. Apr 20, 2017 · Link to 12Vac article on Tubecad: Aikido 12Vac Link to 12Vac build article: Battle of the Cheap Line Stages – Part 1 | Wall of Sound | Audio and Music Reviews There are 3 more parts to this series on this site detailing the build if you are interested. In total, it would not be difficult to achieve a net gain of 30db or so. But Holger sells them as well now. The other that sells a. There is an option to make it a "Aikido 18vac" using a higher voltage power source and 12AU7 tubes. 2 inches), so larger output coupling capacitors could be used; and it now sports a new power supply, which delivers more B+ voltage Mar 26, 2019 · Super sketchy badly soldered & asking for a short test run was successful! Signal is passing through it to the amps and I can hear music. Mar 26, 2019 · At the output of the aikido board. com kits). I can solder, measure voltages using a meter. 1; 2; First Prev 2 of 2 Go to page. At the time I sourced my own chassis and face plate. However, if you; a) only want a line stage, b) don’t have any 6GM8s, c) don’t feel like tracking down some 6GM8s or d) can tolerate working with higher voltages (around 80) you could just build a standard Aikido 12Vac line stage with 6DJ8s. using Erhars Audio's Aikido board along with the power supply board. A name is needed. The ACF 12Vac differs from the older ACF PCB, however, in that it can only use two 12-volt-heater tubes, such as the 12AU7, 12BH7, and JJ ECC99; no 6-volt-heater tubes, such as the 6CG7 or 6H30 or 6DJ8. I've checked all components/connections and they seem to be correct, However, I'm not sure I have the jumpers J1 and J2 properly set up. . The key advantage of the Aikido 12Vac is that it can be operated from a lowly wallwart 12Vac power supply or a 12Vac transformer, yet develop a fairly high-voltage B+ for the triodes. Actually, I have wiring going from the output jacks to it because I forgot to add them prior to soldering the output cables to the board and I didn’t want to remove the wiring from the board again- that pcb is thick and a pain in the ass to remove things from. I’ve been fascinated by the Earmax headphone amp since I first saw it reviewed in HiFi News & Record Review twenty years ago. So here it is: the Aikido Amplifier. ) How it works Jun 9, 2019 · :thumbsup: i really think it's in the way its grounded. He has various preamp and power supply board kits along with complete kits. After building Nelson b1 and opamp based preamp this is the one I feel superior in sound quality really enjoyable and just stopped building preamp after this build. Introducing the new Aikido 12Vac PCB and part kits. Go. At the start of the line stage project, I had hoped to have two for sale. Jump to Latest Mar 26, 2019 · All caps and diodes are installed correctly and it was glowing nicely at all the right voltages until I temporarily attached wires/rca jacks/volume. The cost of the entire build is very cheap when we compare with the Aug 28, 2024 · I built an Aikido preamp. Since your building a 12v version you should be ok. I read a lot of good reviews on the performance of the Glass ware 12ac Aug 22, 2013 · This lead me to wonder whether I could use the gain of the Aikido 12VAC with a 3886/3875 run with lower gain (I believe this is set by a resistor ratio in Audio Sector and Chipamp. It was a nightmare to get it the way I wanted. The Aikido 12Vac board holds stereo Aikido line amplifiers. Jan 3, 2017 · That’s the prototype, also built around an Aikido 12Vac board and I am making it available for sale as well. I’m assuming that anyone attempting either of the two line stages has a soldering iron and knows which end is the hot one. Jan 15, 2020 · As you’ve successfully built the 12Vac Aikido, and if memory serves the Tetra phono as well, the Tubelab EL84 shouldn’t be too daunting. 7K ! But I see pics of several builds[pics] with R13 of 88. rlwhbrkmoiqazbzkagkbydhcdqholbpjjshwedeutzmuftqciwscxp