The 834 valve is a VHF transmitting triode on a UX4 base. Its relatives are the VT62 and the MOV DET12.

As a Class C RF amplifer a single 834 could deliver some 40 plus Watts.

The pressed anode is a finned cylinder and is connected to one top cap. Originally carbon block anodes were used the metal anode being a later introduction. The other top cap connects to the helical grid. The heater and cathode connect to the base. This arrangement keeps the electrode connections away from one another.

The balloon envelope is 62 mm in diameter and, excluding the UX4 base pins, is 140 mm tall.

 
Pin Connections

UX4	1	2	3	4	tc	tc
	f+	ic	ic	f-	g1	a

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa
	7.5	3.1	1250	-90	100

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 02 February 2008 {find valves by name}