|[AMRadio] Screen Modulated 813|
k4kyv at charter.net
Tue Dec 12 13:10:49 EST 2006
> david knepper wrote:
>> If you have one tube like aan 833A running slightly cherry and the other
>> is not showing any color, then, the latter is a weak tube. The former
>> has low emission, in other words.
> Not all 833's are created equal.
> Your statement is not necessarily true.
Depends on the plate current. It should be close to the same for each tube,
with identical grid bias and/or grid drive conditions. If the tubes are way
off balance, chances are the low-reading tube is weak, or the high-reading
tube is gassy.
It's best to have a separate plate meter for each tube, so you can always be
aware of tube balance.
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