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reverse the filament connection and the operating point changes

OK, but a bit like a 2 position gas pedal on your car - not exactly what you would call a fine adjustment...

To get the accurate DC balance you want (and need) - an adjustable bias balance will be needed. Not just for the initial setting but to allow for tube drift across time. My DHT diff poweramps have a top panel metter and the 10 turn trim pot. needs a tweak about once a month - after the first month - during the first month of new tubes it needs a tweak every day...

Regards, Allen


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