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The VR65 ia a WWII military receiving pentode valve made for the RAF. The VR in the designation provides this information, additionally this valve carries the old stores code of 10E/11446.

Commercially this is an SP61 that was developed originally for television RF stages. The SP41 is the same electrically but has the pre-war 4.0 Volt standard heater. The maker has to be Mazda as the base is the Mazda Octal sometimes called the British Octal. It was a rival to the International Octal and lost the battle.

With the grid at the top cap, this is the normal pattern for RF and IF amplifier valves of the period. Providing high gain in tuned anode circuit applications. For additional screening the valve is covered with an external metalisation.

The VR65 was used in air-borne radar particularly GEE.

The reverse is plain.

The classic envelope is 32 mm in diameter and, excluding the MO base pins, is 82 mm tall.

References: Data-sheet & ¹⁰⁴³. Type VR65 was first introduced in 1941. See also 1941 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.