Sorry my mistake they look exactly like the Reflektor 6H23P-EB.
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IMHO old Sovteks and old 6h23's not only look alike they sounded alike in my ARC SP10II, and I think they were made by the same company and just have different designations. I really couldn't pick up a difference tonally or clarity wise. Compared to later Sovteks I thought they had more body and the new(er) ones were very 'cool'. I used them in non-critical locations and they were fine. Not my favorite tube but if you need a 'rugged tube' the old Sovtek/6h23 is excellent.
Who would have thought five years ago that one day we would be comparing various versions of Sovtek tubes and figuring out which one sounds better.....
Just a random observation, as I had also realized that I have two types of Sovtek 6922s in my tube box. The newer ones have a saucer as the getter (w/ shiny plates) vs a ring (and grey plates) you find in older Sovteks.
Look at the trend. These Sovteks will one day be worth over $100 each! I have these Russian 6H23N-EB tubes that I bought of eBay many years ago for cheap. Now they are called "Premium NOS Russian military tubes".
"Plates" is that lower 1/3 section of the tube structure. Kind of look like a rib cage.