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Old 15th May 2009, 01:06 PM   #1
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Default K-12G problems

Hello all,

I have a K-12G kit that I had working for about a year. Well, recently, I took the amp and put it into a new enclosure. I added more inputs and a selector switch. Now when I hook it up and turn it on, I get this loud buzzing coming out of my right speaker and nothing out of my left. My questions for you guys/gals are:

1) What should I be looking at for troubleshooting? Solder joints? Bad components?
2) Am I doing anything to my speakers - I would hate to blow these speakers as they were quite expensive.
3) How can I safely do this troubleshooting - preferably without speakers connected if I may be damaging them.

Only changes made from when it was once working to now was the addition of the selector switch with extra inputs and the recasing into a new enclosure (wood and plexiglass).

Thanks in advance
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Old 19th May 2009, 10:47 PM   #2
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Old 20th May 2009, 07:52 AM   #3
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Maybe the problem is in the selector and inputs.
If You connect selector's out, to ground, is there buzz??
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Old 21st May 2009, 08:30 PM   #4
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I'd start with an ohm meter and trace the input from the connector through the switch to the board.

Do this on the channel that is buzzing first, the problem is likely there.

Also, I noticed that I had buzzing on my amp on the volume pot, until it was grounded. Did you ground the switch?
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Old 21st May 2009, 09:41 PM   #5
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thanks for the suggestions... everything is grounded but i'll double check the circuitry...
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Old 22nd May 2009, 09:52 PM   #6
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Default figured it out... kinda....

hi all,

thanks again for the suggestions... i traced the problem to a faulty switch... one position works and the other 2 don't. it's not a big deal - i'm okay with just one source for now since i'm moving onto a TubelabSE and relegating this amp to the office, where it will only be used for the iPod anyway.
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