Hello, my first post here. I recently purchased a Trace Elliot bass amp head from kijiji. It was shipped to me and was listed as "working great". When it arrived it was definitely not working great. Most of the screws were missing. Someone had opened it up, tried to fix it and just barely put it back together. So I'm stuck with it and would like to try and fix it. I'm a total amateur but I have modded some guitar pedals and repaired a few amps in the past. Replaced capacitors, pots etc.
So what the amp is doing is making a loud hum. Turning the amp up or down makes no difference, there is no sound from the guitar. Just a steady loud hum. It may get a little louder or quieter if left on for a minute. I also notice that one of the two mosfet gets hot the other doesn't. The direct out works fine. So the premap is good. Looking at the board I see one burnt 220 ohm resistor. . I also see one capacitor that looks a little swollen. . I've ordered some resistors, and thinking about ordering the capacitor. Could these problems cause the issue with the amp, or are they likely just a result of a larger problem?
Just hoping someone could lead me in the right direction while I wait for parts. Thanks.
The power board - https://imgur.com/a/U2oTs05
Schematic... https://music-electronics-forum.com/...9&d=1434038910 (I think this is the correct one)
Swollen cap - https://imgur.com/a/wZI9PYj
Burnt resistor - https://imgur.com/a/5R3qac7?
So what the amp is doing is making a loud hum. Turning the amp up or down makes no difference, there is no sound from the guitar. Just a steady loud hum. It may get a little louder or quieter if left on for a minute. I also notice that one of the two mosfet gets hot the other doesn't. The direct out works fine. So the premap is good. Looking at the board I see one burnt 220 ohm resistor. . I also see one capacitor that looks a little swollen. . I've ordered some resistors, and thinking about ordering the capacitor. Could these problems cause the issue with the amp, or are they likely just a result of a larger problem?
Just hoping someone could lead me in the right direction while I wait for parts. Thanks.
The power board - https://imgur.com/a/U2oTs05
Schematic... https://music-electronics-forum.com/...9&d=1434038910 (I think this is the correct one)
Swollen cap - https://imgur.com/a/wZI9PYj
Burnt resistor - https://imgur.com/a/5R3qac7?
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