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Old 5th April 2013, 04:12 AM   #1
Brawndo is offline Brawndo  United States
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Default Replace a balance pot with resistor?

Hi,

I took apart a Technics SA80 receiver to strip for parts. But I decided it still works and it shouldn't have to die so I can play around.

Anyway, I'm in the process of putting it back together. Everything is fine except that I broke the balance pot while dismantling. It's hard to describe the break, but there's no saving it.

I was hoping to somehow put in a resistor or two to basically set it at zero and just have a non-working balance knob. I'm not that worried about changing the balance.

The problem is, I tried a couple different things and don't know how to do this. I tried jumping it a couple of different ways, but nothing is working. The receiver produces sound but is very quiet.

The pot is a 200k G (couldn't find what the G means).

Is this possible?

Thanks.
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Old 5th April 2013, 05:18 AM   #2
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I don't know what the G means either, but two 100k resistors should work. A mental picture of the potentiometer connections compared to individual resistors will reveal the proper hookup. And don't connect the broken pot at all; you could probably turn it 180 and it will still align with the front panel for aesthetic reasons. Or just leave it out and glue the knob to the front panel.
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Old 5th April 2013, 05:29 AM   #3
Brawndo is offline Brawndo  United States
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Thanks for the response. I already desoldered the pot. I don't want any resistance it may be getting running in parallel.

So when you say two resistors are you talking "in" to ground and "out" to ground or some other setup?
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Old 5th April 2013, 06:41 AM   #4
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Is it a single pot. If so, connect two resistors of 100k between the three connections.

one connection--R--middle connection--R--Third connection

Gajanan Phadte
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Old 5th April 2013, 06:48 AM   #5
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The potentiometer placed across the two inputs, with the wiper going to ground.
But it would probably be worthwhile for you to sketch out the pot connections for your amp, since there are many ways to implement a balance control and the description above is just the easiest.
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Old 5th April 2013, 11:58 AM   #6
AndrewT is online now AndrewT  Scotland
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Quote:
Originally Posted by Brawndo View Post
........ the balance pot..........

The pot is a 200k .........
200k and balance pot does not compute.
Can you show, or describe, which part of the circuit it is in?
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Old 5th April 2013, 01:23 PM   #7
Brawndo is offline Brawndo  United States
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Thanks for all the responses!

I've been using the service manual but can't for the life of me find the balance pot on the schematic.

And yes, 200k. I tried attaching the manual, but the file is too large.

Also, I tried resistors in the manner gmphadte described. One channel was very quiet, the other got nothing.
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Old 5th April 2013, 03:27 PM   #8
RJM1 is offline RJM1  United States
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Schematic
http://sportsbil.com/other/Technics-...0W.%282%29.pdf

Balance control on page 9.

You could just take out the balance control and put nothing back (leave empty).
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Old 5th April 2013, 07:54 PM   #9
RJM1 is offline RJM1  United States
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Old 5th April 2013, 08:35 PM   #10
Brawndo is offline Brawndo  United States
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I tried that, but then only one channel works and very quiet. I think I need to do something with a resistor or jumper something.
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