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Old 30th June 2010, 05:00 AM   #1
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Default Fixing a broken pot

I have a older model jensen amp. A ka-3 that has been a good little amp. Till today it went into protect mode. Which I hope came from the pot breaking off the board. It doesn't have much of prongs to solder it back on as I tried.

Trying to figure out what to use to fix this thing. As the pot looks to say b30k on the side. Looks like it was stamped a few times. But it is for the bass boost on the sub side of the amp. Any help would be nice.

Hoping to maybe pick one up a radioshack or something. It doesn't have to be the same length or have the teeth on it for the knob I guess. But has to be the rectangle type pot not a circle one. Thanks for any help
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Old 30th June 2010, 07:29 AM   #2
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Mouser may have something that will work but they don't have a 30k. Click HERE.
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Old 30th June 2010, 08:13 AM   #3
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I have no idea what I am look for though Cept what I already said. If no 30k what would happen using a smaller than 30k or bigger? I would guess more range or less.
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Old 30th June 2010, 03:10 PM   #4
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You'll have to measure the pin spacing on your pot and then find one to match. I don't know the circuit so I can't say whether a 20k or a 50k would be a better substitute. They're only ~$2 each so order one of each.

Are you certain that there aren't other problems? Have you checked the output transistors?
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Old 30th June 2010, 08:49 PM   #5
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I think that is all. It will come on thump. It played once for a sec. Then goes in protect mode. Inside the amp looks brand new. Nothing burned or anything. When it did play for a sec you could tell the bass boost was loud as crap. Should I check anything else. If so what would I look at?

I can snap a picture of it if that would help.
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Old 1st July 2010, 12:23 AM   #6
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Can you post a clear, close-up photo of the top and bottom of the board where the potentiometer has broken off of the board?
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Old 1st July 2010, 01:43 AM   #7
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yea I can do that in a few. It is a 3 prong square one.
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Old 1st July 2010, 02:16 AM   #8
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Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
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Click the image to open in full size.

First pictures is where it is broke then the last is a shot of the board. Sorry not really clear. Someone broke my hd sony cybershot. So I had to buy another cyber shot that is retarded. Have yet to figure out all the settings.
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Old 1st July 2010, 02:22 AM   #9
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It appears that there is no connection (top or bottom) to the solder pad closest to the other potentiometer? Is that true?
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Old 1st July 2010, 02:25 AM   #10
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Are you meaning the pads for the one that broke off or other pot beside it?

The one that broke off. Two prongs are hooked together on the solder pad. The two to the right in the top pic. The other is spaced a hair. As for speaking of the other pots they are spaced out. Unless you are asking where it traces to. I would have to look.
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