Posted on Sunday, 18th July 2010 by Auw Jimmy

I this world, there are lot of tubes, with different filament supply. In most of my tube rectification application, I stand with two choice of rectifier, the one with 5 Volt filament (most Octal and UX type) and the others with 4 Volt filament (RGN or AZ families).

The best way to use two type of rectifier with different filament voltage is to use dedicated switch to select the exact filament voltage. You can also use Resistor to drop the filament voltage (up to 1V drop and 1A), but this way is not recommended due to a lot of heat must be dissipated (also not too good in terms of sound quality to).

I just finish the switch installation this afternoon. Now I can choose to use 4 Volt or 5 Volt filamen voltage. You can see the picture below.

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Tags: Aikido, preamp, RGN, tube rectifier
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