Sensibly equivalent¶ to:
The 834 valve is a VHF transmitting triode on a UX4 base. Its relatives are the VT62 and the M-OV DET12.
As a Class C RF amplifier 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.
Our other 834 looks to be new whereas this has an anode that has been run at much too high a temperature at some point.
The balloon envelope is 62 mm in diameter and, excluding the UX4 base pins, is 140 mm tall.
References: Data-sheet & 4061. Type 834 was first introduced in 1936. See also 1936 adverts.
Absolute Maximum Operating Conditions¶
Updated January 04, 2022.