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If it is problematic, it could explain why a chip behind the return jack gets broken repeatedly – if indeed that is the broken thing here. My impression is that this is ok, but if you think it's problematic, please explain. In case it's relevant, I've used the amp with a Boss GT-10 multifx so that the mfx connects to directly to the return jack. The pinout is the same, but do you think it matters which one I choose? Here are the datasheet for them, in case it's useful: What I have available in the local electronics shop are at least RC4558 (0,50€) and MC1458P. So I could just desolder IC5, put a DIP8 socket in it and replace the chip with some suitable op-amp, and see if it starts working, but I'd like to complicate things a bit and ask for your help to improve my amp repair skills as well, if you dont mind :-) Now I know that many op-amps are kind of interchangable, but I'm not sure which ones are compatible, and what are the crucial characteristics to look for in a datasheet. At any rate it's not the chip specified in the schematic: according to the schematic, IC4 and IC5 are MC1458, but IC5 is in fact BA4558. If I remember correctly (and I'm pretty sure I do), last time the amp was in a repair shop, IC5 was replaced.
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Please correct me if this doesn't sound like a good assessment. When I plug into the return jack, it's basically the same, only without the faint clean sound, so I suspect it makes sense to start by checking the stuff between the return jack and output.
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When I switch the amp off, there's a loud swoosh, plus some guitar sound for about a second, if the strings are ringing at the time of switch-off. When I strum harder, the volume jumps up a lot, and the sound is very distorted, almost in an "8-bit" way or something. The problem: When I plug in, I can hear the guitar only faintly (the faint signal's kind of clean). So I do have intermediate skills in electronics, in a way that I believe allows me to understand most advice I will get here, but I won't manage without help. the basics about voltage divers etc., but I can't really read complex schematics like for amps without someone holding my hand. I have a rudimentary ability to read schematics, know e.g.
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I'm familiar with electronics in general, I have built a dozen guitar effects and some synthesizer stuff, but I'm not particularly familiar with amplifiers. I don't feel like handing out another 100€ for a repair, so I thought I'll try to do it myself (rather than give up the whole thing). I've had a Marshall Mosfet Lead 100 for some years, it's needed repair twice, and now it's the third time there's something wrong with the sound.