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Old 3rd May 2012, 04:24 AM   #1
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Default KLH sub amp help

So, I bought a KLH sub off craigslist for $30. I figured it would be good enough for my pc. Everything is supposed to be in working order.

So, I plug in the sub in place of my HT sub to test it out and make sure everything does work.....That's where the fun begins. I test and fiddle with knobs and different inputs. Eventually I end up plugging in only the sub to my pc system and I can BARELY hear anything out of it.

I pulled the plate and this is what I found....

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

I'm guessing the caps are all toast. Soooo, question is - Should I just replace the amps and keep my fingers crossed that the amp was just run too hard for too long and that's why they blew?

Oh, and I can replace caps rated at a higher voltage right? Or should I replace with the same capacitance and voltage?

Any help is appreciated! Thanks

(to think, I was scammed by my own people....it figures though, they're known to be con artists).
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Old 4th May 2012, 03:04 AM   #2
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Anybody?
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Old 4th May 2012, 04:29 AM   #3
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that is only a kind of glue that is used to fix the caps
if the caps blow, they do so at the top. did it ever work on your pc?
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Old 4th May 2012, 04:34 AM   #4
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Nope. The faintest sound is there but it's barely audible even when you try to listen close.

Power comes on and everything. But when I took it apart there was a burnt electronics odor. Something in the amp isn't happy. And I would have thought glue too but it's not all the same color. Some places it's darker and it seems like capacitor goo.

I guess I can always open one of them up from the top and see if it's empty?
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Old 4th May 2012, 04:38 AM   #5
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cap goo is a thin oil
you can't open it without destroing it.
you can check the AC and DC voltage at te rectifier.

Last edited by AudioSan; 4th May 2012 at 04:44 AM.
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Old 4th May 2012, 04:45 AM   #6
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Is there any way of testing the cap with a dmm?
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Old 4th May 2012, 04:49 AM   #7
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yes. if you check AC ad DC voltage. if the caps are gone to hell, your DC voltage is lower then your AC voltage.
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Old 4th May 2012, 05:48 AM   #8
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Ed a continuity test determine if the cap is still good?
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Old 4th May 2012, 09:47 PM   #9
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I'm a little confused. The rectifier is ac +/- and continuity on the rectifier suggests its working as it should.

The large (5W?) resistors do get pretty hot though with the amp just turned on, with no input at all.

Some of the caps are bulged out at the bottom though...

What's the next step in testing?
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Old 4th May 2012, 10:19 PM   #10
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have you tried it on your HT after you tryed it on your PC?
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