The Variac. | Willie has some sound advice on powering up vintage amps that haven't seen voltage in a long time. A variac can be a very useful tool keep your dusty...
Line 6 Variax 300 Nylon String Classical Guitar Natural | Guitar Center
Subdecay Variac Overdrive | Guitar Chimp
Line 6
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Recommend me a good but cheap variac suitable for tube amps. | Telecaster Guitar Forum