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I think the answer is yes

The schematic shows a "aux power socket". I assume this is to power the preamp.

The difference between a 12au7 and a 6cg7 is .3 amps.

I would think a preamp would draw at least .3 amps of heater current.

The schematic for the non-powered preamp (that I assume goes with this power amp) shows the heater line (pins 1 and 3) being rectified to feed 4 12ax7 heaters.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"


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