Posted by Damir [ 213.202.69.54 ] on May 02, 2005 at 00:41:15:

In Reply to: Re: 300B SET Project - Part 2: The output stage some more posted by Wayne Parham on May 01, 2005 at 17:52:04:

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.:-)

Replies: