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RE: My broader point was...

I know what follows will change no minds but....

I put together a real-life circuit representing your sim: 6.3VAC/6A transformer, 3A/40PIV schottky, 6.8mF filter cap and 100mA avg DC load.

Output: 8.5VDC, 64mV RMS ripple, 225mV PP ripple

Pics of scope:

Ripple waveform with scales adjusted to emphasize apparent nastiness of it similar to what you posted:


Ripple waveform with original 6.3VAC superimposed, both at same scale:



AC output of 6.3VAC transformer with hipass filter and 70mA AC load:


All things considered, I'd take the DC with a little bit of sawtooth ripple over the noisy, 100% ripple power line source for heating an IDH tube hands down. And this is with far less than optimum half wave rectification. Others may choose differently for a variety of technical and aesthetic reasons.


Edits: 12/10/17
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