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

RE: ALT. 1.

"I am rather new to this (surprise!), but I am wondering: what are the technical and sonic implications of the impedance peak in the "audible" range. How does it affect what is produced at the speaker drivers?

Does the increased impedance affect the ability to deliver current or affect the voltage at a given frequency? How does this translate sonically?"

A very good question. I've spent some time today learning some of the basics of how to use SPICE, and I think I've succeeded in modelling a reasonably realistic power supply, with an applied load corresponding to the kind of thing that would arise with a class A single ended amplifier. It seems to confirm more or less the same qualitative features discussed already, in the case of a drlowmu style power supply with small values for the chokes. Namely, some sort of a resonance in the low audible spectrum, resulting in quite a strong modulation of the power supply voltage. Whether it is enough to be audible, I really don't know. But since he says he hears a difference with his power supplies, and since this modulation of the supply voltage seems to be a fairly robust feature of the models, perhaps these two things are indeed correlated.

Chris


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