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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: 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 with around 170V on the plate. At the specified OP it has a gain of over 20. The best part is that it has a plate impedance of 1.9KOhms
PSThe 6197 with 5 x CSD01060A SiCs connected in series at the cathode, should bias the tube at the above mentioned OP with the added bonus of retaining all of its gain and the low impedance due to the avoidance of current degeneration.
https://www.mouser.co.uk/ProductDetail/Wolfspeed-Cree/CSD01060A?qs=D3QG1iK7FqhfQT7VqjsiJw==
Edits: 08/26/20 08/26/20 08/26/20 08/26/20 08/26/20 08/26/20
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Follow Ups
- RE: Very useful info. - sideliner 17:42:51 08/26/20 (0)
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