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Aikido Tetra Sans Phono PCB
Aikido Tetra Sans Phono PCB
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Old 8th October 2011, 06:50 PM   #1
Bengali is offline Bengali  United States
diyAudio Member
Join Date: Oct 2006
Default Aikido Tetra Sans Phono PCB


Has anyone purchased the Tetra Sans PCB from tubecad?

I would really appreciate some help going over the values.

I unclear on a few part values in the manual.

Planning to use 12ax7 in both stages for 50dB gain.

The table for 12ax7 says:
1st stage +B 250V (Iq 3.4mA)
2nd stage +B 280V (Iq 4mA)

There is a chart to determine R18 for the RC's in both stages.
There is something called F3 150uF and F3 270uF.

So I'm trying to figure out the corrrect values for RC stages
to get 280V and 250V.

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