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The VR53 is a screened variable μ pentode designed for radio receiver use. The frequency range of operation would be up to 30 MHz and it was probably used as an IF amplifier. The commercial equivalent is the EF39.

The VR in the designation designates this as a pre-WWII Royal Air Force receiving valve.

This is another example of this type that we have in the collection, and in this case it is encased in the classic shape of glass envelope.

The classic envelope is 29 mm in diameter and, excluding the IO base pins, is 83 mm long.

References: Data-sheet, ¹⁰⁴⁰ & ¹⁰⁴³. Type VR53 was first introduced in 1940. See also 1940 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.