Sensibly equivalent¶ to:
The Cossor OM4 is a double diode triode of the type used in broadcast superhet radio receivers for signal and AGC rectification and first AF amplifier stage and is equivalent to the Mullard EBC33. This specification was made by several companies under different type designations as well as being supplied to the UK services under a CV number.
The classic envelope is 32 mm in diameter, and excluding the IO base pins is 83 mm tall.
References: Datasheet, 1040, 1043 & 3002. Type OM4 was first introduced in 1940.
Absolute Maximum Operating Conditions¶
Updated February 16, 2013. shape:classic construction:pinch type:double.diode.triode age:1930.1940 base:io heater:6.3v pins:8 pin:1.m pin:2.h pin:3.a pin:4.a(d2) pin:5.a(d1) pin:6.- pin:7.h pin:8.k pin:tc.g1