Westinghouse 6SN7GTB - tall, copper rod, black plate. There are other Westinghouse 6SN7s out there. There is a shorter one, with a side getter that was manufactured in Canada. There are some which are rebranded Sylvania. But this one was manufactured in Westinghouse's own tube factory, from some point in the late 50s until around 1967-1968. This tube was also sold under different brands. Several Eico amps and preamps from the early 60s had Eico-branded 6SN7s, most of which were Westinghouse (but some are GE). I've seen them under other labels too, like the 1960s Raytheon 6SN7, Airline, more. Pretty easy to identify given that the tube is taller and has that copper rod. Some of them have gray plates.
