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Two voltages from the transformer |
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By introducing a home made tube power amplifier into the life we will appreciate an advantage to set the anode lower than is in normal operation. Constructors are using regulation auto-transformer or transformer taps. But there is a very simple solution how to get two voltages from one transformer: switching a rectifier type.
See the schematic diagram left. In the first position is to transformer switched Graetz rectifier and DC voltage on the electrolytic capacitor is an AC voltage multiplied 1,41 (e.g. 100V AC x 1,41 = 141V DC). In the second position is switched full-wave rectifier, DC voltage on the electrolytic capacitor is an AC voltage multiplied 2,82 (e.g. 100V AC x 2,82 = 282V DC). So we could easily get two voltages from one transformer.
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