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In Reply to: reverse the filament connection and the operating point changes posted by Allen Wright on January 27, 2007 at 04:43:07:
Agreed on the multiturn pot .
'To get the accurate DC balance you want (and need) - an adjustable bias balance will be needed'
Thats on the original schematic , slightly crude I know . I'm well aware about tight biasing , every amp I've built since 1999 has had a centre-reading balance meter . Just wondering : Do you derive the variable bias of your DPA amps from a negative supply or from a pot in the cathode bias circuit ?
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