Author Topic: Replacing log potentiometer with a different value.  (Read 675 times)

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Offline kris2ff3r

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Replacing log potentiometer with a different value.
« on: October 05, 2017, 08:38:14 pm »
Hi everyone!
I am replacing a volume control potentiometer in an integrated amplifier.
The original one is a motorized 5kax2, log ALPS potmeter. I can't find this exact value anywhere. But I found it as a 10k.

What I'm woundering about is if I could use the 10k, and wire it with a 10k resistor in parallel.
Wouldn't it work just as a 5k pot then?
 

Offline Samogon

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Re: Replacing log potentiometer with a different value.
« Reply #1 on: October 06, 2017, 05:53:04 am »
In parallel it wouldn’t be linear 
 

Online Gyro

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Re: Replacing log potentiometer with a different value.
« Reply #2 on: October 06, 2017, 09:08:46 am »
Impossible to say without seeing the surrounding circuit.

If the 10k is also audio taper then it might just drop in without messing around with external resistors. It depends on:

1)  Whether what is driving the pot is dependent on a 5k end-to-end resistance for some reason (a parallel 10k across the ends would fix that).

2) More importantly it depends on whether whatever is being being driven by the wiper minds being driven by the higher impedance source. Adding resistors isn't going to help with that one without changing the 'law' of the pot. If the load is too low impedance then it will distort the law of the pot.
Chris

"Victor Meldrew, the Crimson Avenger!"
 

Offline kris2ff3r

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Re: Replacing log potentiometer with a different value.
« Reply #3 on: October 06, 2017, 12:45:06 pm »
I can't find schematics, so I don't know how it's wired.
I have some photos, see attached
 

Offline kris2ff3r

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Re: Replacing log potentiometer with a different value.
« Reply #4 on: October 06, 2017, 11:43:45 pm »
All I need to know is; if I'm putting a 10k resistor in parallel with my ALPS 10k log, audiotapper NOT linear potentiometer.
Will it work approx. like the ALPS 5k log, audiotapper exactly the same wattage etc. The only difference between the two is the total resistance.
« Last Edit: October 07, 2017, 12:04:37 am by kris2ff3r »
 


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