[etech]

A buck/boost transformer is a more elegant approach. Usually a 12 volt 1 or 2 amp filament transformer will suffice. It should be wired to buck the supply voltage to the primary of the power transformer.

I ran across this drawing on the web. I thought it might help clarify the bucking transformer arrangement. If you are just doing a single radio, a one or two amp transformer will be sufficient.

[Image: http://i135.photobucket.com/albums/q136/...ormer1.jpg]

Regards,

Ed