Bias adjustment


I need to set the bias on my vacuum tube amplifier.  Does anyone know where I can BUY an amp meter that reads milliamps?  Most I have seen are for large AMP applications.
richfrank

Showing 2 responses by jea48

@ richfrank

I know what I read on the VOM and it was reading 80 mA as it should be,
Shouldn’t the bias be set at 75mA as the manual says?
Bias Adjustment
Set bias for both sides of the amplifier to 75mA


As oldhvymec mentioned in his post is the meter a DMM, digital multi meter? If the meter is a really cheap one its accuracy may not be all that good.
Can you provide a Web Link for the meter you have?

Just curious, how many hours are on the KT 88 tubes. General rule for power tubes life is around 1500 to 2000 hours.

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