The EBF2 is a delightful double diode triode with the Mullard bright red metalising and our exhibit is unused. The valve is a high impedance variable μ pentode, with two auxiliary diodes all sharing a common cathode. This valve would have been used in radio receivers probably with the triode as an AGC amplifier. This would imply communications receivers as broadcast sets would use a straight triode for the audio voltage amplifier.
The classic envelope is 29 mm in diameter and, excluding the Ct8 base pins, is 85 mm tall.
References: Datasheet & 1043. Type EBF2 was first introduced in 1938.
Absolute Maximum Operating Conditions¶
Updated July 30, 2015. shape:classic construction:pinch type:double.diode.pentode age:1930.1940 base:ct8 heater:6.3v pins:8 pin:1.m pin:2.h pin:3.h pin:4.k pin:5.a(d1) pin:6.a(d2) pin:7.g2 pin:8.a pin:tc.g1