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Hey all,
As well as being an amp tech, I play in a band. At our last gig, one of the guitarists turned his amp on (the Dean Markley noted above in the title) and a loud pop came out of the speaker. We realized that the mains fuse was blown so we replaced it but the same thing happened. We set the amp aside and he used a spare he had brought with him.
I took the amp home with me and opened it up. It uses six LM3886's, all of them soldered directly to the main circuit board. On almost all of them, the circuit board is toasted where the 3886 is soldered....not just browned but charred. This is an expensive amp (I think he paid over $1200 for it a few years ago). Unfortunately, Dean Markley no longer has replacement circuit boards and it seems a shame to scrap the amp because of the charred PCB. I've thought of buying a bunch of these: Amazon.com: Lm3886 Amplifier Pcb: Electronics and see if I can cob something together using short jumpers. What I was thinking I would do is cut out the charred circuits (they are on the back edge of the main PCB) and attach the tab of the 3886 to the heatsink just above where it was previously attached and run jumpers from the main board up to the appropriate part of the circuit on the small PCB that the new 3886 is soldered to.
What are your thoughts on this gents and droids? Doable? Don't waste my time? Have him try and sell the amp "as is"?
As well as being an amp tech, I play in a band. At our last gig, one of the guitarists turned his amp on (the Dean Markley noted above in the title) and a loud pop came out of the speaker. We realized that the mains fuse was blown so we replaced it but the same thing happened. We set the amp aside and he used a spare he had brought with him.
I took the amp home with me and opened it up. It uses six LM3886's, all of them soldered directly to the main circuit board. On almost all of them, the circuit board is toasted where the 3886 is soldered....not just browned but charred. This is an expensive amp (I think he paid over $1200 for it a few years ago). Unfortunately, Dean Markley no longer has replacement circuit boards and it seems a shame to scrap the amp because of the charred PCB. I've thought of buying a bunch of these: Amazon.com: Lm3886 Amplifier Pcb: Electronics and see if I can cob something together using short jumpers. What I was thinking I would do is cut out the charred circuits (they are on the back edge of the main PCB) and attach the tab of the 3886 to the heatsink just above where it was previously attached and run jumpers from the main board up to the appropriate part of the circuit on the small PCB that the new 3886 is soldered to.
What are your thoughts on this gents and droids? Doable? Don't waste my time? Have him try and sell the amp "as is"?
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