Jayboris3
Member
Hey diy crew, intermediate tech here and first time poster on the group! I’m banging my head against the wall with the repair of this Ampeg V6B ss bass head. It came in with many a blown output transistor. Replaced all 8 of those along with the driver transistors, bias transistor, and some out of spec resistors. The main filter caps are original and seem fine (?), and someone else before me had done a recap of the power amp section.
Unit powers up fine now but only when unloaded and all of the measurements in the schematic are correct,
but when I attach a 4 or 8 ohm dummy load, the dim bulb ain’t so dim any more. I’ve checked all of the components and can’t find anything thats fried. What am I missing here? Grateful for any ideas. Thanks!
Link to schematic:
https://ampeg.com/support/files/Schematics/V Series/V-6B/V6B Schematics 2.pdf
Unit powers up fine now but only when unloaded and all of the measurements in the schematic are correct,
but when I attach a 4 or 8 ohm dummy load, the dim bulb ain’t so dim any more. I’ve checked all of the components and can’t find anything thats fried. What am I missing here? Grateful for any ideas. Thanks!
Link to schematic:
https://ampeg.com/support/files/Schematics/V Series/V-6B/V6B Schematics 2.pdf
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