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I have the schematic for the amp already. I checked some of the resistors from the power amp board out of circuit and several had drifted way past 10% tolerance...
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Sunn Concert Bass wonky voltages
I bought a '74 silverface concert bass off a dude who had a video on youtube for $50. His video made me cringe, but I figured it'd be an easy fix.
...Last edited by Gioanpj; 03-20-2020, 02:39 AM.
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Here is a link to the service manual: https://www.google.com/url?sa=t&rct=...8c3m5_HXAhWNNd...
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A few questions about the Yamaha b100 power amp and pre amp boards
I recently purchased a Yamaha b100 bass amp off ebay with the intention to recap the amp. I have the list of caps ready to order (Only 12 total!) When I got...Last edited by Gioanpj; 12-05-2017, 12:55 AM.
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I figured it out thanks to everyone's input. The problem was that I wasn't running the neutral wire to the one end of the lamp. Another successful fix. The...
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Hello,
Yes, I will take a picture of the switch when I get home. Looking at the schematic: what is the purpose of the ".0047uf 1000v"...
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So, I switched the primary and hot wires. Same result. I did some more messing, then the amp worked, but no light in either position.
I got...
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Sunn Concert Bass "death cap trouble": pilot light on constantly now
Hi,
I recently removed the "death caps" on a Sunn Concert Bass amp. The amp powers up and functions; however, the pilot light on...
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The capacitors in question were "c105" and "c124." C105 was the capacitor that had the markings "1,5 63v." Now, on the schematic...
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Thanks Tedmich,
I found the capacitors in the schematics you posted.
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Help with capacitor rating codes
Hello,
I'm working on a Sunn Concert Bass head. There are two electrolytic capacitors which have a marking code I am unfamiliar with and can't...
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