| Re: Small HV caps, and pentodes driving power triodes [message #31685 is a reply to message #31684] |
Sat, 31 December 2005 07:49   |
Damir
Messages: 1005
Registered: May 2009
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Illuminati (2nd Degree) |
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Hi, first thing (when I find a little time) is to try CCS parallel to Ra with cascode and pentode, and use a Mu-out.
Some of those pentodes are fantastic on paper (P. Millett`s measurements), say 12BY7, 7054, D3a, ... even EF184. Even distortion profile isn`t bad, the only think I don`t like is rel. low bias (say 1-2V) for the most of those high-gm tubes. With common triodes, PP driver/splitter with more then 2 x 40Vrms clean "swing" and only 300V supply isn`t easy. 
Do you think about (pentode) driver and ct choke as a splitter, or...?
And yes, I can`t find small values HV poly caps, "Wima" has 33pF and more...
Happy New Year - and lot of interesting projects!
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