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807tubenut 19th November 2010 09:22 PM

Aikido REV D pcb
Looking for a good starting point on the resistor values for the 1st and 2nd stage tubes, I have a quad of NOS matched Phillips 6SN7GTB's. B+ is 300v regulated.

DualTriode 19th November 2010 11:15 PM

Check the last page of this user manual.
All Just for fun!

807tubenut 20th November 2010 12:01 AM

Yes, I have that book myself, looking for recommended values, from some one running one of these

DualTriode 20th November 2010 03:25 AM

I have 12SN7ís installed in the octal Aikido I use(B+ := 300). I assembled the PCB thinking that I may try rolling in 12SL7ís at the input position. I have 1000 ohm resistors installed at the input position and 300 ohm resistors installed at the outputs. The 12SN7ís provide adequate gain. I never rolled in the 12SN7ís. The 1000 ohm resistors remain. I have never given them a thought until you ask. The 300 ohm resistors allow a little more current to drive longer interconnects.
All Just for fun!

807tubenut 27th November 2010 02:38 PM

Cool! I got the preamp up and going on the new dynamotor PSU, I need to finish the other stereo board so I can get them in my car!

Ill snap a few pics when I get the system up and going.

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