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RE: final report on switching trans vs halo trans for filament supply

Glad to hear it's working for you.

"Now all I have to do is try and get one of the 60 watt halo units down to 1.5 volts ac and give that a try on the 26's."

After more work on this, I don't think these high step-down ratios will be feasible with the half-bridge circuit. It might be better to gut the oscillator components (except the two switching transistors) and add a daughter board. The added board could use a high speed, differential output device to drive the two transistors. With this approach, frequency could be set using RC components, and the duty-cycle could be adjusted to exactly 50% for ease in setting the RMS voltage. This might also have some benefit in generating the higher filament voltages needed for 211/845/GM70 tubes. I'll post any progress I make with this.


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