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In Reply to: RE: and so.... posted by PakProtector on February 25, 2015 at 05:32:01
so, I was reading the 3rd edition Radiotron book last night wherein they mention an expensive way to sidestep using feedback for a push/pull Pentode/beam tetrode by redesigning the output transformer... Is that what your latest 813 schemo entails?
The Mind has No Firewall~ U.S. Army War College.
Follow Ups:
I should look for that, have you a page number?
I do doubt it is what I am running, that being the E-Linear circuit with a LTP attached to 20 or 30% U-L taps on the plate winding. The 813's are going to get replaced with the original 4E27, and whilst I am under the hood, the 6H6Pi-under-FQP1N60 cascode is going to get replaced with a pair of EL84's.
That deals with output Z nicely; the local FB drops the plate Z of the pentodes nicely...which also benefits the low end response. Will probably hook the final's g2 to 20% and the front end LTP to 30%.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
Page 40, under the heading "Application of Negative Feedback"
The Mind has No Firewall~ U.S. Army War College.
I guess I need to find a copy of Radiotronics 76( 26th May, 1937), pages 42-44...:)
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
I didn't have that one either Douglas.
The flywheel discourse DID remind me ... when reading these REAL old Ham books... that the use of three chokes in series {do not recall anything else} could slightly increase the B+. Had I been further along in learning I would have been far more interested, than I was @ the time.
The Mind has No Firewall~ U.S. Army War College.
Looks like a fun treasure hunt; I'd not mind seeing what they are talking about.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
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