hifi engine

Scott 222 B Tube amp

Dear Friends,
I have a Scott 222B tube amp and it has had a total electrical overhaul.

All the caps have been changed it has been serviced very nicely by my techie

There is however one spare part which is not available and I would be obliged if anybody could guide me or if he has it could send me. Pl suggest alternative also though I doubt if there is any

The part is the volume potentiometer which is uneven on both channels and leaking at zero. According to my techie its

specs are 100K + 500K dual gang with loudness option and on/off switch.

please do help me on this as this is a very sweet sounding amp paired up with vintage celestion speakers. Thanks in Advance