mark58
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Lon, I haven't tried the 6922 types either but the 50's 5751s are very good and plentiful, I have several to roll. Right now I've been enjoying standard 60's Amperex 12AX7s in both ZP3s for a while.
Joe's take on them..."Tung Sol 5751 - this guy is a bit of a sleeper and odd man out here, but its worth grabbing if you stumble on it cheap. This tube is a bit different from the others on the list in terms of physical design. All of the other tubes here are of the 3 mica spacer design with short wide plates. This tube, on the other hand, has an internal construction similar to a traditional 12AX7 -tall ribbed grey plates with no 3rd mica spacer. Perhaps as a result of this it sounds a bit like a cross between the two types - while it is not quite as focused as the other top of the heap 5751s, it does have avery good sense of life, body and ambience."
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