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In the Forum: Melquiades Amplifier
In the Thread: Gas voltage reference 0A2 tubes.
Post Subject: Improved shuntPosted by N-set on: 1/18/2008
Apart from "raw" VR's there is also a brilliant solution due to steve bench:
http://members.aol.com/sbench/norchv.html
The tube must operate in A2 and have high gm,
as the shunt impedance approaches 1/gm.
I did something like that with choke loaded 811A
as the shunt tube, powering 801A.
(it was just a model, so no comments on the sound;
on the scope worked nicely). But of course implementation
is a PITA, compared to a single cap.
If one doesn't want the equlibristics with finding the right A2 capable, high-gm
tube which happens to have the right characteristics given the possible VR voltages,
one can couple the grid to the line via a cap and then R to ground (std. thing).
cheers,
jk
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