Sensibly equivalent¶ to:
The EBC90 is an amplifier triode with double diodes sharing the same cathode connection and was designed for use in superhet receivers. The HBC90 is the same valve but with a 12.6 V 0.15 A heater.
Seen in profile the two diodes are the outer structures while the triode is housed in the central dark anode. The central cathode tube is coated within the triode and then a second patch of coating has been applied to the part that extends within the twin side anodes.
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 EBC90 was first introduced in 1953.
Absolute Maximum Operating Conditions¶
Updated January 29, 2013. shape:thin.glass.tube construction:all.glass type:double.diode.triode age:1950.1960 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