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OTL, Output Transformerless Amplifier User Group.

RE: Are all the power tubes OK?

I tested all the power tubes with my Hickok tube tester to make sure no shorts or grid leakage are present and even matched the tubes so that one bank of power tubes has equal readings to the other bank of tubes. Will the visual inspection matter after that? I replaced three tubes that tested poorly to ones that tested well and can test them again to see if they died after being put in circuit. Not really sure why the soft sound or if it even has anything to do with the DC offset issue.

I guess I can also retest the 6sn7 tubes to make sure they are still good. Mine has two banks 6 power tubes per bank and five 6sn7 tubes in a row starting by the power plug which is where the DC offset meter is and headed across the back from left to right. Are these tubes set up to be top and bottoms of a circuit where one has a greater effect on sound? Just casting things at the wall at this point.



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