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

VR65 is the Royal Air Force designation for the Mazda SP41 valve. It was developed in the late 1930s for use in television receivers. It was found to be very suitable for use in radar equipment and was produced in large quantities during World War II for that purpose. It is a pentode with a high transconductance, designed for use in wide-band amplifiers.

This is one of the few valves to use the 'Mazda Octal' base which was deliberately designed to be incompatible with the American (International) octal base.

Physical Description

Slightly shouldered glass bulb on Mazda octal base (seven pins present) with top cap. Grey metal spray coating on bulb and top of base.

More Information