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In Reply to: DAC offset on ma-1 posted by ChasLieb on November 18, 2014 at 19:52:28:
On a 12-tube model the driver tube is the last one of the row in the rear, away from the input connectors.
If one section is weak, this can cause a DC Offset that can't be corrected.
Another symptom of a bad driver tube is the DC Offset mysteriously changing without any other reaction from the amp (such as an obvious output tube arc).
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Follow Ups
- The driver tube can also cause this if bad. - Ralph 09:31:14 11/19/14 (4)
- RE: The driver tube can also cause this if bad. - ChasLieb 18:14:51 11/20/14 (3)
- RE: The driver tube can also cause this if bad. - Ralph 08:54:14 11/21/14 (2)
- That was it! - ChasLieb 07:09:46 11/23/14 (1)
- Isn't it nice - Awe-d-o-file 07:57:17 12/01/14 (0)