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FWIW, I had luck using a 600 ohm:600 ohm modem isolation transformer to achieve filament isolation on an older RCA 12" B/W with a heater-cathode short. The modem was an older 1200 baud modem, and the transformer is about a 1-1/2" cube. It worked for the time I had the set running. The back got seriously deformed by my space heater this winter and will no longer fit the set.
Dunno the frequency range of the transformer, but it had to include the lower baud signals.
Cheers,
__________________
Brian
USN RET 22YRS (Avionics/Cal)
CET-Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"
When fuses go to work, they quit!
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