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RE: Why use a voltage doubler in med-high (400-550V) B+ supplies?

One great use of a voltage doubler is to get a screen voltage that is half of the plate voltage in pentode/tetrode amps. The power transformer might also be a bit easier to wind as you have a lower ratio.

There is nothing evil about a voltage doubler as long as your power transformer is designed for the task. It is not fashionable because some amps gave it a bad name, maxing out the power transformer in a voltage doubler and casuing the power supply to be really saggy.

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