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Single Ended Triodes (SETs), the ultimate tube lovers dream.

Actually...

I have tried switch mode power supplies in tube gear more than once for filament power. I have never been sucessfull. The problem is not interestingly enough the HF hash. This can be filtered and is mostly out of the audio band in any significant amplitude. Plus with seperate cathodes, it's shielded even more.

The problem is most switchers have nasty non uniform (read can't cancel out) 60hz or 120hz spikes from the input rectifier / filter. This is impossible to eradicate on an OEM supply. Perhaps if someone designed an "audio grade" switcher you could deal with that. And it seems Phil Marchand may have done just that.

So for my tube gear I stick with EI transformer supplies. My SS audio gear uses toriod linear supplies. Sometimes a switcher will sneak in if I have CPU/DSP requirements needing several amps at +5 or +3.3 volts such as my latest project. A DSP based sub woofer processor.



Edits: 02/28/12 02/28/12 02/28/12

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