Sensibly equivalent¶ to:
The H30 is a high-μ triode with a 300 mA heater. The heater at 13 Volts and 300 mA was designed for use in Ac/DC receivers or from 12 Volt vehicle batteries.
It was designed for low microphony. The L30 is the low impedance version and has the same heater requirements.
The Marconi name on the reverse.
Thanks to Mark from Vintage-parts for sending these images.
The classic envelope is mm in diameter, and excluding the B7 base pins is mm tall.
References: Datasheet, & 1043. Type H30 was first introduced in 1934.
Absolute Maximum Operating Conditions¶
Updated August 07, 2019. shape:classic construction:pinch type:triode age:1930.1940 base:b7 heater:300ma pins:7 pin:1.m pin:2.- pin:3.- pin:4.h pin:5.h pin:6.k pin:7.a pin:tc.g1