Stupid middle of the night question

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Stupid middle of the night question

Postby justinsweber » Wed Jul 08, 2009 1:17 am

Ok... being a bit sleep deprived... nothing like 18hour days...

I can roll any 12AU7/ 12AX7 into the DIY70 driver without adjustment?

I was using JJ 12AU7s, just had 8 NOS GE 12AU7s come in... thought time to upgrade... But I can't remember what the F the pots on the driver board are for... I'm thinking the current between each pair of output tubes?

Thanx for the basic info... Brain is just not working.
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Postby TomMcNally » Wed Jul 08, 2009 10:56 am

Yep - you can change the 12AX7 and 12AU7 tubes all you
want - no adjustments necessary. The trimpots on the
driver board are bias balance.
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