They're not exactly the same but can be used in place of 6922's as 6922's are used in place of 6dj8's. I've used them in audio research LS-15 and PH3SE preamps. They're very good nos tubes better than any stock 6922's
6H23P and 6922 are close enough for Leonard at ARC to tell me that I should be able to put one in my venerable LS2B without running the risk of frying any vital gizzards in the old girl. Have not tried the swap yet though.