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Old 29th March 2013, 04:32 AM   #1
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Default power flickering on tube cmoy amp

Hello, I made a 12au tube cmoy amp from a kit on ebay. It worked great for a while, but now the power is blinking on intermittently but won't stay on. The led light below the tube flicks on then off for a few seconds, then blinks then off etc. There is a soft popping sound from the headphones when this happens. I checked my solder connections and they seem to be ok. I used another 12v power supply to see if it was that but it wasn't.


Any ideas?

I made two of these, the other one started to sound like I was listening to a faint tin can. I replaced the chip with a burr brown chip and now it works fine. I'm wondering if Key West's famous crappy power system is affecting the amps.
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Old 29th March 2013, 12:03 PM   #2
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The first problem is a power supply issue, possibly a dry joint - which can be a pig to find :-)

If you want to send me pic of both sides of the boards I'll see if I can spot the problem - I've looked at a lot of them :-)
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Old 29th March 2013, 04:28 PM   #3
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Thanks, here are the pictures!Click the image to open in full size.
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Old 29th March 2013, 04:28 PM   #4
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Old 29th March 2013, 04:29 PM   #5
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Old 29th March 2013, 04:30 PM   #6
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Old 29th March 2013, 04:31 PM   #7
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Old 29th March 2013, 04:31 PM   #8
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Old 29th March 2013, 10:03 PM   #9
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Hi first things first the OPamp is in backwards

cheers
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Old 31st March 2013, 03:11 PM   #10
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Well, that certainly fixed the glaring problem, thanks! The power stays on, there is sound, but the sound is cracking and popping. Dang.
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