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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 :-)
Follow Ups:
I suspect that is a rebranded Philips Holland tube. The X9G is a Philips code.
Not anyone knowing anything about tube date codes..........??
Rgrds olaps
I'm not sure about the rest of the codes but the 5-56 would indicate a May, 1956 manufacture date.
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