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Old 25th October 2006, 04:13 PM   #11
cerrem is offline cerrem  United States
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dhaen is correct...
Most tube data sheets will indicate MAX Class A voltage....
Which really means the valve can really handle twice that voltage +20% .... SO iF your max Class A plate voltage is 400V DC... The valve should normally be able to AC swing to 800V with arc-over breakdown at roughly 1000V or so .....
It is really the sum of the DC idle voltage plus the AC swing that dictate where you can go with a valve.... This means that you need to watch the plate load swing if your running higher B+...
Many Push-Pull circuits run higher than data sheet voltage and can do so safely in Class AB... SInce each valve usually doesn't go higher than the rail then goes into cut-off, which is still lower than the full AC swig it would experience in Class A ....

Chris
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Old 25th October 2006, 04:24 PM   #12
dhaen is offline dhaen  Europe
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A much clearer and better detailed explanation. Thanks.
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