Bypass Balance Pot?

[starbender]

Hi,


I'm restoring an old philips ah305 amp and realized balance pot is damaged psysically. I checked the schematic already. Pot is back to back as balance and volume. Balance pot part is revers for one channel as I see.



It is unusual design, at least for me..


Any idea how can I bypass balance pot without affecting design and sq?


Schematic attached.


Thanks!

 

[U230421]

Consider the black section of the balance potmeter as a 0Ω resistor, so a 22kΩ resistor can replace it on each and separate channel. Keep the rest intact.

 

[PRR]

Cut&scrape the PCB copper on the purple lines.

Jumper on the yellow lines.

Balance is centered same as original, but now permanently.

 

[starbender]

Thanks, I'll try and report back.

 

[Trelolelo]

Hi,


I'm restoring an old philips ah305 amp and realized balance pot is damaged psysically. I checked the schematic already. Pot is back to back as balance and volume. Balance pot part is revers for one channel as I see.



It is unusual design, at least for me..


Any idea how can I bypass balance pot without affecting design and sq?


Schematic attached.


Thanks!

You need to check how the signal line goes through the potentiometer, I mean with the ohmmeter check the resistance in the middle position ... if you measure half resistance of the potentiometer resistance, better to connect 2x10kohm resistors as dividers, for each channel ... if you don't measure the resistance in the middle position you can connect it as PRP described it above....

 

[starbender]

I measured the resistance at various positions already. At the middle, one side reads 12.6kohm and other side reads 250ohm.

 

[Kay Pirinha]

I think this already comes clear with the schematics. The balance potentiometers aren't drawn the common way, but with a black upper half instead. This needs to be interpreted as a zero ohms part of the track.

Best regards!