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The ME1401 sub-miniature wire ended triode was designed to be soldered into the circuit as reliability was deemed to be of the same order as the rest of the components. The anode (pin 2) is marked with a red paint spot.

The ME family were all instrumentation amplifiers with very high input impedances and classified as electrometer valves.

The thin glass tube envelope is 9 mm in diameter and, excluding the lead out wires is 41 mm tall.

References: Data-sheet & ⁴⁰³² Type ME1401 was first introduced in 1950. See also 1950 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

PDF scanned from an original document held by the museum