Summary

6.3 V indirectly heated cathode, manufactured for the Royal Air Force (R.A.F.), England, 1940-1945.

VR53 is the Royal Air Force designation for the commercial EF39 valve. It is a remote cut-off pentode designed for use in radio and intermediate frequency amplifiers.

Physical Description

Small shouldered glass bulb with top cap on octal base. Sprayed metallic coating has almost completely fallen off the bulb (valve is kept in plastic bag).

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