NR7 triode. The NR7 is the British Navy's designation for the Royal Air Force's R7 type.
Manufacturer: M.O. Valve Company, England.

Used on H.M.S. "Renown" on her visit to Australia with the Prince of Wales in 1920. Marked "manufactured by the M.O. Valve Company Ltd., G.E.C. Made in England.

Admiralty pattern with horizontal electrodes. Terminals pattern with horizontal electrodes. Terminals top and bottom on each side of base. Plate volts 150, filament volts 4 at 0.5 amp. Admiralty patterns 5427.n.r.7, 47749".

Physical Description

Tubular bulb mounted on special base with top cap connected to base by a copper strip and mounted on small display block.

More Information