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variac

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variac

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A variac is one approach to power-supply based power attenuation, to make the sound of power-tube distortion more practically available. en.wikipedia.org

It's a variac, so there's no isolation, but the bulbs have nothing to do with that. hackaday.com

To prevent this in tube equipment, the voltage can be slowly brought up using a variable transformer (variac) on the mains, over a twenty or thirty minute interval. en.wikipedia.org

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