The TE994 is an indirectly heated triode employing the UK original AC heater voltage of 4.0 Volts. The design purpose was for use as a detector or audio voltage amplifier.
The Makers name and Type designation are on the dome of the envelope.
The balloon envelope is 44 mm in diameter, and excluding the B5 base pins is 99 mm tall.
References: 1043 & 3002. Type TE994 was first introduced in 1934.
Absolute Maximum Operating Conditions¶
Updated November 27, 2014. 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