Re: HT for a car radio
There are circuits around which use mains transformers in what are called "Solid State Vibrators". These are evolutions of the sort of thing used in WWII, but the electromechanical switcher is replaced by a transistor, driven by a pulsing circuit. So, switching the 12-0-12 winding, you can take HT off the 240 winding.
There certainly have been a number of threads on SSV on the forum in the past.
As David points out, an inverter will be more efficient, but finding the transformer may be more difficult. If you find the carcass of an old RT like Pye Cambridge, there'd be an inverter consisting of 2 x OC35's and a small transformer there which would do.
B
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