[Joeztech]

I remember getting a filament transformer when I was in high school to operate a late 40s Buick radio in the house. The filament transformer had to be rated at 6.3VAC filament output that was better than the expected DC amp input to the original vibrator power circuit in the Buick radio. The car radio was permeability tuned and really solid with two 6V6GT tubes in a parallel single ended output stage. It was a great performing radio bought cheap at a wrecking yard. It turned out to be a rather large filament transformer in order to handle powering the entire car radio, but worked well. At the cost of heavy current filament transformers these days it would probably just be less expensive to buy an isolation transformer that was designed to do just that function with wattage rating adequate to handle any AC/DC chassis you expect to work on. The 300-400 watt range should handle just about any radio you would encounter. Many radios draw less than 200 watts power from the 120VAC line.

The main thing is to consider your own safety above all else. Don't get yourself into a dangerous situation. A known good isolation transformer is a worthwhile expense when your life is at risk.

Joe

Joe

Joe