Nice to know! I didn't have a clue of the difference until now, I just knew something was different from the non-A. Looks like they made the right changes to it.  The one in my 7 is an "A" version, installed in 1965. It has lotsa life in it, infinite life test. It might as well be NOS. I'm glad as it is the only set that I have with a CYP, my 9 has the sulfide FBP installed 4-68.
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Kyocera R-661, Yamaha RX-V2200
National Panasonic SA-5800
Sansui 1000a, 1000, SAX-200, 5050, 9090DB, 881, SR-636, SC-3000, AT-20
Pioneer SX-939, ER-420, SM-B201
Motorola SK77W-2Z tube console
McIntosh MC2205, C26
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