6550 plate dissipation is around 42W , you must never exceed this value , bias depends on B+ voltage and class of operation ...
Look at this Link: TDSL Tube data [6550]
Anyway i bias amps to get minimum cross-over distortion at max output power before clipping and assuring i'm not exceeding the plate dissipation rated...
Look at this Link: TDSL Tube data [6550]
Anyway i bias amps to get minimum cross-over distortion at max output power before clipping and assuring i'm not exceeding the plate dissipation rated...
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