▼ Menu

    
Extras ▼

The M-OV type R5V was a landmark valve in that it was the first British high-vacuum receiving valve to incorporate a sprung 'inverted V' filament of the type which later became universal. The R5V is a bright emitter valve using a pure tungsten single strand filament.

The filament is a single inverted V and the spring arm is seen above the anode. The grid construction is clearly visible. See also R5V.

Type R5V was successful both technically and commercially. Like the type R it remained listed until the outbreak of WWII and many samples survive.

The R5V from Marconi-Osram was a general purpose valve, similar to the original R-type, and made from the early 1920s in considerable quantity. Our exhibit has the BBC stamp that dates it to between November 1922 and September 1924.

The differences from the R-type were a lower anode resistance and the 5.0 V filament. The construction has altered from the basic design of the R-type.

The balloon envelope is 42 mm in diameter and, excluding the B4 base pins, is mm tall.

References: ¹⁰⁰³. Type R5V was first introduced in 1922. See also 1922 adverts.

Absolute Maximum Operating Conditions^¶