My bias readings tend to wander all over the place. Sometimes a given tube will be plus or minus ten percent of the 70 mA it ought to be running.
Is this normal? Do the output tubes "settle down" after they've run a couple hundred hours?
TomMcNally wrote:Are you measuring the bias with no signal ?
or are you taking them weeks apart?
The tubes age, temperature affects things, as
does line voltage, how long the amp has been
on when you measure them, and even the
resistance of your test points.
10% is nothing to worry about.
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