Posted by Damir [ 213.202.113.219 ] on May 23, 2006 at 15:28:51:

In Reply to: Do you think it is possible... posted by Russ57 on May 23, 2006 at 13:32:07:

IMO - no, the voltage "swing" is only +/- 70Vp maximum, B1+ = 400-410V and Ua=190V. Lacking the scope, I can`t see the waveshape at the CCS output, I can only tell what I heard. The sound is very clean and direct - not a sight of distortion.
I think that Pete Millett measured about 0,04% THD with CCS-ed D3a in triode with 10Vrms out...It is about 0,2% with 50Vrms out, pretty good.
The load is high-impedance grid choke.
Again, I don`t have a THD meter...huh. But, Russ - I lose the interest about theoretical speculations a bit - this empiric (trying different things and listening test) phase is even more interesting. I`d also like to know why the tube with lower rp sounds "softer" then similar, higher rp one? Then sound of capacitors and resistors, PS...
Yes, I have various theories...based mostly on theory - but again, without proper measurements I can have just the part of the picture, for now.
Anyway, the amp sounds fine - I think that I`ll use E180F for the driver...huh, I have only two....for now...

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