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Farouk 30th December 2012 03:51 AM

Opinions for 6550 bias.
Are there any recomendations for cathode bias in push pull amp with two 6550 per chanell?
I'm using G.E.
Happy new year to all!!!

Vincent77 30th December 2012 07:44 AM

Yeah, each 6550 should have its own decoupled cathode resistor, do not share one R between two tubes.

Farouk 30th December 2012 10:20 AM

ok,i won't share one R with two cathodes,but could you help me with the bias adjustment?

Tesla88 30th December 2012 11:56 AM

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...

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