AuditoryCanvas
500+ Head-Fier
Just grabbed 2 pair of these, got my 1983 pair in my amp at around 250 hours and sounds quite good. These are 72/73 vintage and I read in another thread they are brand new. Too big for my dac though.
https://www.ebay.com/itm/6N3P-6CC42...ta-Codes-1972-1973-Lot-of-2-pcs-/262376047249
That was me. Same seller. The ones I got are solid. Look like new, nickel pins, and all tested at least 100% gm.
I have a big batch of '75s with gold grid and nickel pins arriving at end of this month, so I'll be selling some matched pairs soon after, if anyone wants any without having to wait a month for them to arrive.