shimmilou
Well-known member
- Joined
- Mar 18, 2013
- Messages
- 162
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Man that sucks! I would seriously press MB for warranty repair. If you decide to keep it, you can probably get some help here in sorting out the issue, and I would be glad to help, realizing that not having the schematics can be a hindrance. Initially, particularly after your second go-around, it seems like a possible shorted output tube that is pulling down the bias circuit. At this point, your best bet might be to check the bias circuit for burnt resistors, with the amp off and unplugged from electricity. The circuit would be fairly easy to trace, starting at pin 2 of the output tubes and working back to the bias supply. After checking the circuit with no power applied to the amp, replacing any resistors if necessary, you can pull all output tubes and power on for further checks. At minimum you will also need all new output tubes, not knowing which tube might be possibly shorted, as it might not be the one that was red-plating.