A used Mullard ECC83 valve in working order.
It has been tested on an Avo Mk3 Valve Tester which can determine both plate current and transconductance, and the readings are good slightly low on the plate current, but fine on transconductance (see below).
Actual Readings
Triode 1
ia (mA) - 0.9
GM (mA/V) - 1.6
Triode 2
ia (mA) - 1.0
GM (mA/V) - 1.6
Data Book Specification
ia (mA) - 1.2
GM (mA/V) - 1.6
V3
