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 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 WW2 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.

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va
	5.0	0.7	30-120

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This exhibit was last updated on 02 December 2007