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GIbson G10. This was a failed repair sadly. This amp had poor sound and a buzz. I went on an insane quest to find a MPF161 transistor and eventually found a replacement and  the amp sounded very clean with extremely low noise floor! It lasted only 2 weeks and buzz came back, and its origin was never found unfortunately.

GIbson G10. This was a failed repair sadly. This amp had poor sound and a buzz. I went on an insane quest to find a MPF161 transistor and eventually found a replacement and the amp sounded very clean with extremely low noise floor! It lasted only 2 weeks and buzz came back, and its origin was never found unfortunately.

It is a solid state amp from the early 70s or so. Like most of these old SS amps of this era the output transistor is a 2N3055 -- the standard, seemingly.

It is a solid state amp from the early 70s or so. Like most of these old SS amps of this era the output transistor is a 2N3055 — the standard, seemingly.

Gibson G10, G20, G30 schematic

Gibson G10, G20, G30 schematic

Gibson G10 parts list

Gibson G10, G20, G30 parts list