3 6BM8 /ECL82 Telefunken RCA GE tubes 1960s tested used

Three 6BM8 /ECL82 tubes 1960s tested, used.

Two are branded RCA but marked Made In Germany and have the "diamond" between the pins and the getters look like Telefunken so they were most likely sourced from Telefunken by RCA, as was commonly done by tube manufacturers back then.

These are both marked 6BM8/ECL82 and have RCA in tall red font as well as the RCA "meatball" logo, so they date prior to the late '60s. The RCA silkscreening is faded. One has "BW" printed on the glass and the number 20 in the "diamond" between the pins. The other tube is identical but has no two letter code on the glass and the number between the pins is a 12 above a 3, like a fraction.

The GE tube is marked 6BM8/ECL82 and silkscreened KY 188-5 indicating that it was manufactured in GE's Kentucky factory in either 1965 or 1975. It also has what appears to be G147 OG2 etched on the glass. As far as I can tell, this one's not a Telefunken.

All have gray plates. The getter flashing looks nice on all three tubes.

All three test strong, 112/111 (the one with the "20" between the pins) 118/114, (the one with the "12 3" between the pins) and 115/113 (the GE tube) on my B&K Dyna-Jet 606 emissions type tester. Minimum good is 65, max is 120 on this machine. Zero grid emissions, no abnormal shorts. Not selling as matched since I don't own equipment capable of matching tubes. NOT amp tested, so I cannot say if any are microphonic or noisy.

Sold as satisfaction guaranteed, returnable but buyer pays all shipping & handling costs in the unlikely event of a return.