I went back and restored the B+ to the original higher level, 425v on the plate of the 300b verses 375v. This raised the D3a plate to 192V, up from 155V. So I have the grid of the D3a at 2.2V for about 9.5ma.
So how does it sound? Good, very good. In the neighborhood of outstanding, but not in the house yet. Compared to my references, DRD 45’s this amp is more lively but not as refined.
So we’re dancing to the electric blues and that’s good enough for now…John
Huh...maybe we must "reconcile" with the fact that cathode biased (R//C) triode, transformer-coupled with XYZ speaker can`t be totally sonically neutral. On the top of this, "traditional" tube PS (rel. high Zout and probably high Q, too) has it`s own impact on "sound"... We can try to find transparent-sounding driver, or driver which is sonically "complement" to the rest of the amp... I have a friend who has the pro-rec. studio (currently big and small active PMC monitors) who said it nice:"No way that I`ll use this (my 300B SE) amp for the job...but I want it at home, for listening the music!" Hey, that`s a compliment, actually!
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