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In Reply to: RE: 6922 and 6SN7 Soviet Substitutes posted by erik on October 13, 2020 at 15:28:30
Gets a bit confusing when you consider translations from Cyrillic alphabet bet to Latin alphabet, but the 6922 is translated either as 6n23 or 6h23. There are other letters after those, but the "n" and "h" are as close as you can get to the symbol for pi, from Cyrillic, in the Latin alphabet. See at the link below, about half-way down that page, is an explanation of those letters that come after.
I've forgotten the Soviet 6SN7 numbering, but as I recall there are two types. The 6H8C (or something close to that) types that pretty much all suck, and then an earlier version (who's number escapes me) with large holes in the plates, that's quite sought after. I've been out of the 6SN7 world for a long time and recollections of that type are sketchy.
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