danbowskill Posted February 5, 2023 Share Posted February 5, 2023 (edited) I had my great condition pro 3 on my bench adjusting the MOSFETs, I gave it a micrometer of a turn and they were reading pretty spot on...where I left the amp running half HR or so with no problems.before I put the lid back on I thought I'd give it another quick check,when I touched the mosfet leg with the multimeter clip (as shown in picture) it made a crack and quick spark.not sure what the damage is...could be a simple fix or could be a big fix 🤷.doesn't appear to be any scorching or damage anywhere else.i did switch it on quickly afterwards where it cut out after a min or so (protection mode).collection or Can meet within reason.Happy for someone to Arrange their own courier. Edited February 5, 2023 by danbowskill Quote Link to comment Share on other sites More sharing options...
Woody1957 Posted February 6, 2023 Share Posted February 6, 2023 Such a shame mate, although l'm pretty good at repairing things till they're broke😕 1 Quote Link to comment Share on other sites More sharing options...
paul_5 Posted February 6, 2023 Share Posted February 6, 2023 Either way it's still a great sounding preamp. 1 Quote Link to comment Share on other sites More sharing options...
danbowskill Posted February 6, 2023 Author Share Posted February 6, 2023 5 hours ago, Woody1957 said: Such a shame mate, although l'm pretty good at repairing things till they're broke😕 I know,gutted.i might save my pennies yet n get it looked at. Quote Link to comment Share on other sites More sharing options...
Woody1957 Posted February 6, 2023 Share Posted February 6, 2023 I used to have an American made pro 3 with the blue lettering for years and it was a great amp. For some reason some bassist found it underpowered but as long as you kicked in the eq section l never had a problem. As someone mentioned, the pre amp is really good. Is it worth having it repaired?....its worth having it looked at tbh. Quote Link to comment Share on other sites More sharing options...
Hellzero Posted February 6, 2023 Share Posted February 6, 2023 Check diodes D27 and D28 as I don't know (from just looking at the photo of the short cut) if you put the +61V or -61V to earth with your probe when touching the resistor (not the MOSFET) leg and the ground. Check that resistor too. 😉 SVT III Schemo.pdf 1 Quote Link to comment Share on other sites More sharing options...
danbowskill Posted February 7, 2023 Author Share Posted February 7, 2023 Sorry to anyone interested,gonna withdraw it for the mo. 1 Quote Link to comment Share on other sites More sharing options...
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