RCA Black Glass 12AU7 1950s ?

Tubes Asylum

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I was going through some of my favorite 12AU7 variants which are the Amperex Heerlen 7316s made in the late 1950s and early sixties , which I consider the only real 7316s along with the ones that are labeled ECC 186 from Heerlen. The stuff being hawked on eBay as 7316 like Tungsram I think is disingenuous.
I came across various other 12AU7s but one pair really stuck out which was a pair of Joint Army Navy JRC 1950 and 51 black glass RCA 12AU7s. The reason I am looking is because I bought a $69 one tube Bravo brand headphone amp. The 7316s are great as usual but the JRC black glass are just as impressive if not more so. Have these tubes got a following? If not I think they should. The bass this little tube makes is phenomenal with really palpable 3 dimensionality and all the effusive audio praise language I can think of. Anybody else know about these, I don't see them often.

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Topic - RCA Black Glass 12AU7 1950s ? - Mechans 17:14:25 05/06/15 (4)

I suppose they are 40s production - Mechans 15:47:27 05/08/15 (0)

Do they look like these? - FenderLover 04:02:34 05/07/15 (2)

RE: Do they look like these? Yep - Mechans 13:10:47 05/07/15 (1)

1940s era 12AU7 and 12AX7s - FenderLover 18:28:26 05/07/15 (0)

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