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Repair of a broken slide balance pot
Repair of a broken slide balance pot
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Old 1st April 2018, 11:34 AM   #1
MattiaM is offline MattiaM  United Kingdom
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Join Date: Dec 2017
Location: London
Default Repair of a broken slide balance pot

Hi,

I am repairing a vintage amplifier which has many issues, including a broken slide potentiometer with center detent for balance control.

One side of the control works just fine, whereas the other has a broken connection between the resistive element and the pin from which current should flow. it's a microscopic fracture in the flat conductive trace barely noticeable, but it's enough to break the connection.

Since the part is unobtanium, I was thinking of ways to fix it. I can't put solder on it because it needs to stay flat in order for the wipers to make good contact and to not get stuck.

The only options I have in mind are to cover the fracture with conductive paint, or with some conductive epoxy.
However, I am worried about the wipers might just take it off after a few strokes.

Does anyone here have any advice or suggestion?

Thanks
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Old 1st April 2018, 12:35 PM   #2
MattiaM is offline MattiaM  United Kingdom
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Join Date: Dec 2017
Location: London
After some cleaning, the fracture in the broken trace is now quite large.
Here is a video with the broken pot:

YouTube
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Old 1st April 2018, 01:03 PM   #3
gflash is offline gflash
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Join Date: Jan 2015
You might use electrically conductive glue/ink. I don't think that the resistive element is solderable.
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Old 6th April 2018, 11:44 PM   #4
MAAC0 is offline MAAC0  Portugal
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Join Date: May 2010
On my amplifiers the balance knob stays always in the same place (middle). Why don't You just replace it with two resistors ? Leave the original just for cosmetics. You can always put a rotary pot in the back side case You ever need it.
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