[AMRadio] potentiometers

[kk4tr]

I was wondering if anyone out there knows of a place that I can get 
Potentiometers for my Viking Valiant.  Yhe Grid drive control took a dump 
yesterday morning and I have been having difficulty finding a place to buy 
one either nos stock or even a brand new one.  The one that I need is a 25K, 
4 watt wire wound unit.  I think I replaced this one once before so a 
regular carbon will work .  The last one was and I think it lasted about 10 
years!!!!! Any help would be greatly appriciated

Joe KK4TR