Pardon my ignorance, but it is the first time I hear that instead of the 6922, a 6H23 tube can be used. What is the origin of this tube, I mean, what manufacturer and date can be considered NOS....the first time I heard of this tube is that it was being used in some BAT gear, I thought it was a sort of super tube, usually made in the old Soviet Union or something. If this is the case, what are the advantages of using this tube instead of the classic and now, almost non existant stock NOS 6922 and EC88s?
