Sensibly equivalent¶ to:
This exhibit is a Ferranti D4 triode from the 1930's and was designed for use as a detector or audio voltage amplifier. The valve is indirectly heated and designed for parallel connection and uses the UK 1930's standard of a 4.0 Volt 1 Amp heater.
The balloon envelope is 44 mm in diameter and, excluding the B5 base pins, is 100 mm tall.
References: 1040 & 1043. Type D4 was first introduced in 1933.
Absolute Maximum Operating Conditions¶
Updated February 07, 2013. shape:balloon construction:pinch type:triode age:1930.1940 base:b5 heater:4.0v pins:5 pin:1.a pin:2.g1 pin:3.h pin:4.h pin:5.k