Originally posted by 52 Bill
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Kustom K200A.4
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Normally there are two small pc boards mounted on the back panel near the foot switch jack. One for each 24 volt supply, each with a large power transistor.
All of the boards should have pc numbers on them. Which ones do you have there? I'm wondering is somebody swapped in some newer boards in there.
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Originally posted by 52 Bill View PostNormally there are two small pc boards mounted on the back panel near the foot switch jack. One for each 24 volt supply, each with a large power transistor.
All of the boards should have pc numbers on them. Which ones do you have there? I'm wondering is somebody swapped in some newer boards in there.
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Originally posted by 52 Bill View PostWell, you can see that there were transistors mounted to the chassis, but they have been removed and replaced with the power resistors and the diodes.
What is the problem with the amp? What boards do you have in there?
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Originally posted by 52 Bill View PostThose are the correct A series boards. You were testing voltages before you found out that there is no 24 volt power supply. How is the boost circuit powered?
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The boards in the amp should be 2-preamps PC102, power amp PC702, Reverb/Trem/Vib PC302A&B, Boost/Clipper PC402A&B, and the two missing boards PC502 and PC602.
You could change the two Zeners and increase the voltages up to 23 volts or you could add a couple of three pin voltage regulators. I need to recharge my camera, but I will take photos of the boards for you.
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Originally posted by 52 Bill View PostThe boards in the amp should be 2-preamps PC102, power amp PC702, Reverb/Trem/Vib PC302A&B, Boost/Clipper PC402A&B, and the two missing boards PC502 and PC602.
You could change the two Zeners and increase the voltages up to 23 volts or you could add a couple of three pin voltage regulators. I need to recharge my camera, but I will take photos of the boards for you.
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Originally posted by 52 Bill View PostThe boards in the amp should be 2-preamps PC102, power amp PC702, Reverb/Trem/Vib PC302A&B, Boost/Clipper PC402A&B, and the two missing boards PC502 and PC602.
You could change the two Zeners and increase the voltages up to 23 volts or you could add a couple of three pin voltage regulators. I need to recharge my camera, but I will take photos of the boards for you.
Cheers
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Originally posted by olddawg View PostI would be tempted to recreate the two missing boards on perf board if you can find a layout and/or a circuit diagram.
Here is photo of the two regulator boards.
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Originally posted by Jazz P Bass View PostInteresting how the -23V rail is 'controlled' by the +23 V rail.
All of the 200 series amps used this approach whether it was +&-24 volts or +&-8 volts. If both voltages were off, then you check the positive regulator. If only the negative voltage is off then check the negative regulator.
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