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In Reply to: RE: ideas on variable filament supplies? posted by BofService on July 23, 2015 at 07:49:34
The problem lies with potentially audible artifacts from the switching noise. I use a switcher on my 211 filaments, but it's modified to operate above 60kHz. Most of the cheap (and not so cheap) PS units operate too close to the audio spectrum to be viable for this use without significant filtering. I'm not sure it's worth going this route by the time you include the extra work. Filament transformers from Hammond and Edcor aren't very expensive, and eBay lists numerous adjustable regulator boards and kits if DC is needed.
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Buy Chinese. Bury freedom.
Follow Ups:
I have got some of the halogen trans. The dc to dc converters are variable so I can try them on anything. I not sure what frequency they run on.I will get to the halogen supplies when I build my big amp. I am finding it hard to find a good reason to stop listening to my 10y amp at present.
actually I do know now Working Frequency:300KHZ
below is some of the bigger ones I bought.
Some good info here. I too am interested in using a 6.3VCT @10A filament transformer for 2 866A rectifiers in series at 5v@10A. Any thoughts greatly appreciated.
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