Sensibly equivalent¶ to:
The DH77 amplifier triode with twin signal diodes on a common cathode. It was designed for use in superhet receivers at the end of the IF chain and as the first audio amplifier feeding the output stage.
The thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 46 mm tall.
References: Datasheet, 3002 & 1040. Type DH77 was first introduced in 1950.
Absolute Maximum Operating Conditions¶
Updated May 15, 2015. shape:thin.glass.tube construction:all.glass type:double.diode.triode age:1940.1950 base:b7g heater:6.3v pins:7 pin:1.g1 pin:2.k pin:3.h pin:4.h pin:5.a(d2) pin:6.a(d1) pin:7.a