Racerxrated
Well-known member
This. I have a Variac; I use it with my 72 Marshall as those early 70s power transformers want to see 110v in the US….which is why many old Marshalls have replaced PTs. Works great. 200$.Not sure why anyone spends that amount of money on a Brown Box. A variac can be dialed into the exact voltage you want and its way less expensive.
https://www.circuitspecialists.com/products/variac-variable-ac-ps05kva_with_digital_display