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The 354V from Mullard is a detector and general purpose audio valve. The design originally operated with a maximum anode voltage of 200 and was improved in 1930 and again in 1935 with the final design having a 250 Volt maximum anode rating. The mutual conductance also increased over the development cycles from 2.4 to 3.4 mA/V.

This 354V from Mullard has the classic shouldered envelope design and is screened with an external metallising paint. Where the paint has worn off the glass underneath is opaque.

The original 354V triode dates from 1929 and in 1935 the heater current requirement was reduced to 0.65 Amp. This example has a 0.65 Amp heater and thus can be dated to the mid 1930s or later.

The reverse is plain.

The classic envelope is 42 mm in diameter and, excluding the B5 base pins, is 92 mm tall.

References: Data-sheet & ¹⁰⁴³ Type 354V was first introduced in 1929. See also 1929 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

PDF scanned from an original document held by the museum