Sensibly equivalent¶ to:
DD6DS MEB4 TEB4 VEB4
The EB4 is a pair of signal diodes in a single envelope. Each section is internally screened. The EB34 from 1941 is almost identical but has slightly higher inter-electrode capacitances. The EB4 was designed for signal detection.
The stamp on the back is a BBC test indication.
The balloon envelope is 31 mm in diameter and, excluding the Ct8 base pins, is 60 mm tall.
References: Data-sheet, 3002 & 1040. Type EB4 was first introduced in 1936.
Absolute Maximum Operating Conditions¶
Updated February 09, 2013. shape:balloon construction:pinch type:double.diode age:1930.1940 base:io heater:6.3v pins:8 pin:1.m pin:2.h pin:3.a pin:4.k pin:5.a pin:6.- pin:7.h pin:8.k