Tube DIY Asylum

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Bias transformer trick.

Posted by gusser on May 24, 2017 at 15:01:16:
I trick I have used when lacking a bias tap is to use a reversed filament transformer.

Take a 12vct unit, 100ma is more than anough, and hook the centertap and one of the secondary legs to your filament buss. This will give you 60vac to play with for the bias supply.