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Maybe I 'm taken a step forward . I mesured the tied resistors 82K and 62K : instead 82K only 48K , and instead of 68K only 58K . I changed the resistors , and the bias is ok again ... 47V , and it sounds healthy again . But now is a noise as that grows with the gain , but rushes suddenly no...

Hello everybody ! I have a cal. 50+ combo (6L6 version), which sounds terrible. Sounds scratchy and edged, the sound does not hold, I tested the voltages, and have bias voltage of -80 volts on both 6L6 ! That would have to be according to plan -47 V. Unfortunately, it seems that the schematics...