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In Reply to: RE:Do you remember what you did to provide the 6dj8 voltage? posted by DAK on December 8, 2017 at 21:18:24:
for the front-end and see how much more NFB we could use around the OPt valves and OPtrannies.
The Opt Z on an 80hm tap is now below 1 ohm from 100Hz on up and below 1.5 down to 50 Hz.
For over two decades one amp was driving a critically-damped, quasi-Butterworth 3rd-order (QB3) reflex enclosure, with an Fb of 38Hz.
Each spherical enclosure at unequal distances from floor, side-wall and front-wall, 1:1.5:2.25. So we expected and got, good bass down to 30Hz or so. The bass-mid driver in these rolled off cleanly just above 3.3khz, and had L-rise Eq using an R&C across the terminals.
The second amp was wired in triode mode and drove the large soft-dome tweeters and the HP-only xover.
So only ONE PSU was working hard!
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
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- I just wanted and my tech. agreed we should go with low Mu high GM tubes in the front-end, and cut the NFB - Timbo in Oz 21:08:08 12/09/17 (0)
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