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Glass-ware Aikido 12vac build
Glass-ware Aikido 12vac build
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Old 15th August 2019, 03:15 PM   #1
qguy2000 is offline qguy2000
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Default Glass-ware Aikido 12vac build

First off my skills.

I can solder, measure voltages using a meter. I have recapped a Pioneer SX-1050. Troubleshooting skills in non existent. I just replaced parts based on the schematics and or instructions from forums.

I read a lot of good reviews on the performance of the Glass ware 12ac Aikido pre. I am a just a bit concerned about the documentation/schematics that is included in the kit. I have heard that there are several errors on the documentation.

Does anyone know if the documents / schematics / manual has been updated ?
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Old 15th August 2019, 03:45 PM   #2
petertub is offline petertub  Sweden
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Glass-ware Aikido 12vac build
Don't listen to gossip. "I have heard" without sources or other documentation is gossip.


I have good experience of their kits, go for it !
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Old 15th August 2019, 04:31 PM   #3
rayma is offline rayma  United States
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Their kits are very high quality. Study the schematic and parts before starting.
You can post any questions here before assembly.
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Old 15th August 2019, 09:34 PM   #4
vconsumer is offline vconsumer  United States
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I built one of these. The only error in the documentation was that it suddenly cut off near the end. The parts are all neatly labeled as is the circuit board, so no problems putting everything together.
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Old 16th August 2019, 03:04 AM   #5
lavane is offline lavane  United States
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I've built a couple Aikido's. I'm pretty sold on them. First I built a 12au7 version, then a 12ax7 version. The one I'm using now uses 6sn7 octals. I'm perfectly happy with the latest one. I've used and built other preamps, but the Aikido is by far my favorite.
Have fun with your build!
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Old 19th September 2019, 04:52 PM   #6
qguy2000 is offline qguy2000
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I have assembled my unit, this is the 6dj8 Version which requires the 12v ac transformer

target is 80V for B+ and 25.v for heater voltage

These are my measurements

Without Tubes

Voltage across C2 B+ 104v
Voltage across C10 heater 26.6v

With Tubes
Voltage across C2 B+ 93.8
Voltage across C10 heater 19.6

Last edited by qguy2000; 19th September 2019 at 04:55 PM.
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Old 19th September 2019, 04:57 PM   #7
GoatGuy is offline GoatGuy  United States
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In the spirit of DIYaudio … could you include a schematic, so that C₂ and C₁₀ actually can be visualized?

B+ of 104 volts unloaded, and 94 volts loaded does not sound out-of-spec. If there is a resistive hum-filter in the power supply, a –10 V drop is fairly usual. Can't say much about your C₁₀ measurements without a schematic diagram. Capturing with your smart phone would be good enough!

Just saying,
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Old 19th September 2019, 05:10 PM   #8
qguy2000 is offline qguy2000
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Hope this helps

C2 — imgbb.com

c10 - Imgs.info

12vac — imgbb.com


Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Last edited by qguy2000; 19th September 2019 at 05:19 PM.
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Old 20th September 2019, 08:50 AM   #9
qguy2000 is offline qguy2000
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Input voltage is 12.8v

Measured the voltages again without changing anything. I noticed R15 (47ohms) was getting really hot that I could not touch it and it started to smell

I replaced R15 with the physically larger 20 ohm resistor and it gets hot after 30 seconds or so. Without the tubes, R15 does not get hot as much

Voltages after I replaced R15, Tubes installed

Voltage across C2 B+ 94
Voltage across C10 heater 23.4
Voltage across R15 10.8v


Without the tubes, measurements below

Voltage across C2 B+ 103.6v
Voltage across C10 heater 26.8v
Voltage across R15 7.2v
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Old 20th September 2019, 02:07 PM   #10
qguy2000 is offline qguy2000
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EDIT: I inserted a 2 amp resistor on the secondary and it blows
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