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RE: Using 6sn7 + 6bl7 for SE driver?

"I do have to tweak the current output of these in my Sun amp to keep the plate voltages in line so the direct coupling works properly and the driver stage has enough headroom."

Am I reading this right.

Leaving the current the same and just changing the cathode resistor value (thus changing the plate voltage which of course IS the bias voltage for the output tube) can leave you with too little headroom in the driver stage?

I always liked the idea of an adjustable cathode resistor on the driver tube as the bias adjustment for the output tube with a CCS loaded driver tube and direct coupling.

And being a SE guy, if I ever build a direct coupled SE amp this is how I would plan to fine tune the bias of the output tube.

BTW I haven't seen your schematic and I may not understand.

Tre'


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Edits: 10/27/14 10/28/14

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  • RE: Using 6sn7 + 6bl7 for SE driver? - Tre' 22:21:55 10/06/14 (0)

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