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Allo

I didn't say this explicitly but the audibility of the power supply might support the theories about the flux modulation being bucked by the combo of coil and PS.

I mostly wanted to mention the layering idea and - ah yes, that was it: see if you can source rectangular section magnet wire to wind the coils with. Without thinking about it in depth, I think this may give you the best heatsinking and better fill factor/DCR relative to circular conductors.

Actually, if heatsinking is an issue, you can probaby saturate the coil and cavity with ferrofluid :-O
Might be expensive and have no benefit whatsoever of course...

Quick question: why do you think 50-100V is important? The magnetic field will be determined by the number of turns x the current. More turns = thinner wire, higher resistance so less current. I will have to do the sums but it may be that the flux vs heat tradeoff is better as you increase the current. Certainly the lower impedance coils will have less self-capacitance and may buck the flux better.

I suspect this or other considerations drove Steve's decision more than blind imitation of the RCA (which, as I mentioned, was available in 117V version).

cheers

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