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Floobydust,

excellent points as usually. I am not too concerned about the AC noise on my filament, at least at this point. I want to get the right “check and balance” operation of the whole amp (all channels together) and then will see how the MF noise will manifest itself. The opinions of my technical advisers are sharply divided: some of then strongly advocate DC and some of them AC. I personally have a strong bias to AC, despite that I have a lot of theoretical justifications that DC shell be more reasonable. Still, I have an open mind about it and it is not difficult to try DC. One of the reasons why I do not want to do it so far is that I do not want to have another variable of sound – to think how the filaments PS would sound.

Your signal-to-noise points are well take and it is how I felt but I have something else in my mind – modulations. The 50Hz hum shall do it a lot into HF. You are also was correct that 50Hz ham on a scope is not the sinewave but rather some multi-wave crap. Another thing that keeps me wondering with my 110dB sensitively and compression driver is the fact that I have very light and very susceptive diaphragm that being stressed with 50Hz shall toss a lot of Doppler distortions. Well, the list might continue and we all agree that there are a LOT of theoretical reasons to DC with high sensitivity – let see how it goes practically. I still, if I will be able to go away with it would prefer to stay with AC.

There is another interesting direction to go – to run filaments from high frequency AC. I think it is what David Berning does. If someone would know any ready to be used 50 kHz -250kHz PS that can do 1-2A then let me know, I would like to try it. I think that subject is so obvious that it shell be some companies out there that shall have some the off the shelf solutions. It truly very simple a 150kHz oscillator and very small class D amp without even any filters in output. I think I need to call to PurePower people and to proposed them to do a new product… I hope someone has already had it.

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