The LD210 is a battery amplifier triode designed for detector of audio voltage amplifier use.
The dome carries the identification and the five pointed star is characteristic of Tungsram. This exhibit was made in England and not imported.
The classic envelope is 38 mm in diameter and, excluding the B4 base pins, is 83 mm tall.
References: 4063, 4064, 1040 & 1043. Type LD210 was first introduced in 1935.
Absolute Maximum Operating Conditions¶
Updated January 03, 2013. shape:classic construction:pinch type:triode age:1930.1940 base:b4 heater:2.0v pins:4 pin:1.a pin:2.g1 pin:3.f pin:4.f