You can buy variacs... just about anywhere (that sells electronic items, that is). In its simplest form, it's a wall-wart with a multiposition switch on it indicating different output voltages per position... You just need the appropriate variac (i.e. TALK to a sales tech)
Make sure you don't reach HIGHER voltage than the caps indicate (70? 80? V).
HOWEVER, I strongly suggest you get a TECHNICIAN to do this.
Make sure you don't reach HIGHER voltage than the caps indicate (70? 80? V).
HOWEVER, I strongly suggest you get a TECHNICIAN to do this.