Sensibly equivalent¶ to:
The HL23 is a low power low impedance low gain, battery triode. The data-sheet describes the HL23 as suitable for a range of application areas within a receiver including AF amplification.
The reverse of this exhibit showes the old stores code 10E/159B as well as the crown and A logo of the UK Air Ministry.
Thanks to Stef Niewiadomski for sending these images.
The classic envelope is 30 mm in diameter and, excluding the MO base pins, is 67 mm tall.
References: Datasheet, 1040 & 1043. Type HL23 was first introduced in 1938.
Absolute Maximum Operating Conditions¶
Updated March 20, 2017. shape:classic construction:pinch type:triode age:1930.1940 base:mo heater:2.0v pins:8 pin:1.f pin:2.- pin:3.a pin:4.- pin:5.g1 pin:6.m pin:7.- pin:8.f