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Alex...

Just to expand on what Alex is describing... You will need to be sure the electronic transformer (power oscillator) has a toroidal transformer at its output. The modules I've purchased in the past used miniature conventional transformers, much more difficult to modify (I wouldn't try). Searching eBay recently, I did find a few sellers that post pics of the inside of their modules, and several show a toroidal design in that position. Also, just to be clear, Alex is telling you to add a CT to the output transformer in order to power the filament. I assume the CT will be grounded, just as in the case of a 60Hz filament transformer.

Alex, I'm pretty sure you said recently that you've found some of the electronic transformers that are already designed to oscillate at 50 or 60 kHz. All the modules I've purchased ran at roughly 20 kHz, so I had to modify them. Can you point us to a specific seller for this? In my case at least, it would need to have a 120V primary, not 220V.


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