Vintage genuine British made STC and ITT CV1653 3A/108A triode amplifier tubes in the original boxes. These are all made in the same factory (ITT took over from STC in the late 70's)
This item is shipped from Britain, in North America or Asia please allow 2 to 3 weeks for delivery.
3A/108A is a medium gain (mu = 30), triode signal tube similar to US type 30 (2 volt filament) but with a different base. For more information, see data sheet :http://www.tubezone.co.uk/pdf/3A-108A.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.