Vintage genuine British made 3A/172B HL1320 CV1670 STC and ITT triode amplifier tubes. These are all made in the same factory (ITT took over from STC in the late 70's). Please contact us directly for availability on this tube type and compatible sockets.
This item is shipped from Britain, in North America or Asia please allow 2 to 3 weeks for delivery.
3A/172B is a medium gain (mu = 30), triode signal tube with a B7 British base. For more information, see data sheet : http://www.tubezone.co.uk/pdf/HL1320.pdf
Tubes are tested with an AVO tester and test within normal factory tolerance for plate current and transconductance, and are tested for leakage and shorts.