10-10-2021, 08:51 AM
I watched the video - impressive!
But what are the valves? Video title says 2 x 1zh24b as does the 8- October post; video commentary says the output is a '29b as does the diagram.
(I can't see the '24b driving a loudspeaker without being over-run).
One Qu: running the output valve without bias, and setting anode current by Vg2 gets you where you want to be. But does this allow sufficient headroom for the AG swing on g1 without running into grid current? Could you cope with stronger signals with a bit of -ve bias, and higher Vg2?
But what are the valves? Video title says 2 x 1zh24b as does the 8- October post; video commentary says the output is a '29b as does the diagram.
(I can't see the '24b driving a loudspeaker without being over-run).
One Qu: running the output valve without bias, and setting anode current by Vg2 gets you where you want to be. But does this allow sufficient headroom for the AG swing on g1 without running into grid current? Could you cope with stronger signals with a bit of -ve bias, and higher Vg2?
