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This Post Has Been Edited by the Author
In Reply to: RE: Very useful info. posted by andy evans on August 26, 2020 at 15:28:29
Glad you have these chokes to experiment with. Just to elaborate a bit regarding my comment on the quality of the choke, it has more to do with the shunt capacitance / leakage inductance characteristics rather than a high-ish inductance value. Same criteria that govern good IT performance apply here as well.For this reason I suspect that the 157G will not be a good match as it's designed to be a PSU filter choke where wide bandwidth is a detriment and not an asset.
If you're going to entertain noval tubes like the EL84 you also might want to look into the 6197 / 6CL6 in triode. You can bias it with a 150 Ohm cathode resistor and it will be drawing 30mA at around 180V on the plate. At that OP it has a gain of over 20. The best part is that it has a plate impedance of 1.6KOhms
Edits: 08/26/20 08/26/20Follow Ups: