Here's another repair blog episode.
GWAR is in the studio working on a new record and this bass amplifier popped it's mains fuse during tracking so I wanted to get this amp working again fast so it could get back to work. Luckily it only needed new output tubes and to verify the problem was indeed the tubes I put them in a tester to look for any obvious faults.
To bias these amps they must be set to 80mV (some models may require 100mV) and you take the readings from a convenient test point located in the back of the amp. Once you have set your bias you then must balance the two sides. A very simple procedure and it is very nice feature to be able to do this without pulling the chassis from the headbox.
This is the same amplifier as the Sunn 300T.
I really dig the way this amp sounds. Hope you enjoy.

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