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Topics - Joh Woodpecker

Hi everyone! I just got one of these with a 4x10 cabinet (it has really nice sounding Eminence Alnico speakers) but the amp has a problem, I suspect a failing filter cap or a problem in the power section.

Does anyone have a schematic for the Randall RG90? I searched the net for a while but only found an old thread here about the topic.