Date codes, RCA 6SN7GTB

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Hi, I have bought a pair of RCA 6SN7GTB to my CAYIN 9084-D amps.
On the (black) base these are marked 59EX9.
On the box it's printed: R-CC 8 (5-56).
Anyone knowing what this means?
BTW, the tubes sounds very good :-)
Best regards
Ola P

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Topic - Date codes, RCA 6SN7GTB - olaps 12:05:11 12/02/06 (3)

Re: Date codes, RCA 6SN7GTB - Catch22 16:09:37 12/03/06 (0)

Re: Date codes, RCA 6SN7GTB - olaps 04:45:13 12/03/06 (1)

Re: Date codes, RCA 6SN7GTB - Alnicoman 07:24:53 12/03/06 (0)

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