The amp maniac story

 The Amp Maniac was developed in response to requests for a completely  variable version of the Tone Preserver. You can dial in any  output voltage you desire with the knob on the top of the unit. The Amp Maniac is the same size and weight as the Amp Preserver, so its easy to  handle and take to a gig. Unlike other variable transformers on the  market, the Amp Maniac will not allow you to exceed the line voltage and  blow up your amplifier. It is also not recommended that you run your  amp at less than 90 volts for obvious reasons. The Amp Maniac is fused  at 2.5 amps of current.