Posted by Damir [ 213.202.115.85 ] on February 15, 2006 at 15:27:53:
In Reply to: Cascode....hmmmm...have you considered/tried posted by Russ on February 15, 2006 at 09:28:57:
Unfortunately, I don`t have any 6H30Pi, ECC99 and similar "candidates".
I tried BP Raytheon 5687WA and E182CC (Philips and Amperex) I have.
Just looking in a few sheets of papers, full of measured numbers. I tried three cascode variations, with many little tweaks. Full "report" soon.
"Slightly romantic" SE 300B sound can be ("wickedly") described also as warm/distorted, limited on both frequencies extremes, slow, soft, compressed... 
Every change is "interactive", and IME - it isn`t easy to find the "right" sounding driver circuit.
And without FFT/THD and frequency plots I can only suspect that "strident" E182CC sound have something to do with odd upper harmonics, or "warm", "dark" and "mushy" 5687 sound with some other (lower) harmonics/IMD... And yes, good soundcard is expensive. Expecting some NOS sockets, and more E182CC, 5687 and 6C45Pi tubes these days.
And yes, CCS can sound a little "dry"... this afternoon I tried CCS loaded 6J5GT driver, sound not bad, but (of course), A only 21.
P.S. I used AZ50 rectifier tube, my choice between all 5R4GYB, 5V4G/GZ32 and GZ34 tubes I tried...
"Besides, we WOULD drive ourselves crazy with FFT plots and THD values...LOL!"
Don`t tell anybody, but I don`t need that papers with numbers...nor I used schematics...it`s everything in my head...and not much of anything else...
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