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In Reply to: RE: Questions about 6BG6G amp build (schematic) Grommes 216BA posted by PeterI on May 22, 2017 at 21:02:33
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.
Errr...connecting half a 12.6V to 6.3 VAC will deliver full primary voltage( as in 120V ). If you hook the whole 12.6 winding up to 6.3, you will get 60VAC out on what used to be its primary...:)
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
Thanks. I would have to find a very small xformer and have 2 that match, in this case. Most of my 12V formers are for filaments, 2A+.
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