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I was tested the amp in “integrated” mode and even I do have very low noise from the DHT tube but with my sensitivity and with my distances I do hear some ugly noise. I did not realized that the nose is moderate when I lose 3dB of my MF attention to integrate my MF with the rest of channels but when I run it wide open then it kind of unpleasant.

Well, with my entire hate of the DC idea I think I might be forced to go there. It is very pity…

 So, if the dive, or at least trey of DC on filaments would be in order I wonder is any specific DC topology for filaments would be advisable? I might go foe my regular SS Schotcky rectification with following LCRC. I have in the amp a 12.6V and 6.3V, coils, both for very high current, that drives 6C33C that and from there my 2.5 and 4V of LC filtration. But since it will be DC I would like to have an option for multiple voltages…

I have 5A regulated PS up to 33V that I used for my filed coil project; I will try it for temporary used. Still, the filaments in DH are the cathodes and I am VERY suspicion that the quality of the filaments shall matter a lot.

http://www.diyhifisupply.com/files/tenlabs-application-notes.pdf

http://www.diyhifisupply.com/files/tentlabs-dht-heating-methods.pdf

http://www.diyhifisupply.com/files/tentlabs-supply-chart.pdf

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