If you have 100v coming out of the wall and your amp is made to work with 120v, then you can increase the voltage coming out of the unit to interface better with the amp. With a Variac you can dial down the voltage to 110 coming out of the unit to send to the amp. For example, if you have a vintage amp and it was made for 110v operation, running it on 125V out of the wall is bad for it. By the time you can hear a change in the tone or distortion, you are. It is just as bad for tubes to run the filament voltage too low as it is to run them too high.Ī Variac is useful to match voltage coming out of the wall to the voltage specified for the primary of the power transformer. A variac pulls down/up all the voltages in the tube amp, including heater. The closer the filament voltage is to its spec, the longer the tube last. The down side is that when you use a Variac with an amp, it affects all the voltages, high voltage and filament.
Guitar players have used Variacs in the past to both lower and raise the voltages in an amp. I'm not sure if the Bogner has a real autotransformer in it or not, but what it sounds like is that there is a circuit that switches between two sets of voltages to allow either 20W or 40W operation.
#VARIAC FOR GUITAR AMP HOW TO#
In this second part, we’re going to get our hands dirty and really get to grips with how to get the best out of our software amps. There is a rotary knob that allows you to dial in a range of voltages. In the first part of Guitar Amp Simulators 101, we looked at the fundamentals of choosing, setting up and getting started with an amplifier plugin. There is a socket on the front that you plug an amp into. I have a stand alone unit that plugs into the wall. A Variac is actually a trade name for a variable AC transformer.
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