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Original Message
RE: 6N1P
Posted by Brad225 on January 15, 2023 at 12:48:29:
In the amps there are 20 turn variable off set resistors for positive and negative voltage. You need to adjust both to "0" volts in order for the power tubes to bias properly.
With all 4 new tubes in either amp they would not allow the voltage to be adjusted from between 5-6 volts to "0".
When we put the old same manufacturer tubes in, both amps would allow for "0" volt adjustments for the circuits.
It is very strange but no other conclusions than the new tubes are the problem.Down side is I have had the tubes for 6+ month and can't find the receipt or any email related to the purchase. I will call VIVA Tubes but, I don't hold out much hope of a refund or receiving a credit toward the Voshkod tubes.
It is a good thing my EE friend is incredibly smart and built and rebuilt many pieces of audio equipment.