| Re: 300B SET Project - Part 2: The output stage some more [message #31081 is a reply to message #31077] |
Sun, 01 May 2005 23:41   |
Damir
Messages: 1005
Registered: May 2009
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Illuminati (2nd Degree) |
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For cathode biased amp, Uak=350V, Ugk=70V and voltage drop on the primary windind resistance Urw p = 148*0,08 = 11,84V. Then our B+ is 350+70+12=432V DC. I`d "play" with similar OPs, but this is "working" version.
And for the "optimum" Ra... depends of what OPT you have /can find:-)
I have a LL1664 (3k:8 Ohms), but better solution would be LL1623 (3k/5k6:4,8,16 Ohms, 90mA), then you have more options to try.:-)
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