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Old 30th December 2012, 03:51 AM   #1
Farouk is offline Farouk  Greece
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Default 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!!!
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Old 30th December 2012, 07:44 AM   #2
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Yeah, each 6550 should have its own decoupled cathode resistor, do not share one R between two tubes.
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Old 30th December 2012, 10:20 AM   #3
Farouk is offline Farouk  Greece
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ok,i won't share one R with two cathodes,but could you help me with the bias adjustment?
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Old 30th December 2012, 11:56 AM   #4
Tesla88 is offline Tesla88  Italy
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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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