Vintage Potentiometer to digital Potentiometer problems

I have modify a vintage wooded radio into a digital amp with bluetooth. It work great, but since I wanted to have the outside look I had no choices but to hack the 20k potentiometer on the digital amp (lepi 30$) to use the original Potentiometer.. the vintage one.

I'm looking to find a way I can fix this Potentiometer so it would reach the 20k.
The Potentiometer on the Lepi circuit board is a b20k for sure, but I don't know about the vintage one, there no info written on it.

it's 2 questions for one thing, fix this volume so it won't blowout the speakers.
1- how to fix this ? I believe a resistor should do the job, but 'how much resistance needed?
2- if this is a resistor, well how do I solder it ? (6 wires, which one?)

Any help would be greatly appreciated!

rickharris3 years ago

Why not extend the shaft on the right sized pot if it is too short?

sebdub (author)  rickharris3 years ago

yes indeed, I've tried, but I would need a single size shaft, the way I've tried is with a joint with 2 screws, this take too much length so it won't fit inside. Basically I can use ducktape or other glue stuff, but I don't have the feeling this will last for many years turning this know with 2 parts shaft... still the real thing is the best, but it does not exist, even mouser don't have it.

sebdub (author) 3 years ago

I have not found a POT with a long nob at 20k...

the long nob is still the problem with this POT


adding a resistor will only make things quieter. I suggest finding a new POT with the range you need a a shaft large enough to accommodate the vintage knob. At the very least it can have a long enough post that can be modified to accept the vintage knob. Start looking at part suppliers like Mouser. They should have what you need.