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834

Sensibly equivalent to:
304A 3T50 4304CA BW11 CV1062 DET12 NT58 TY1-50 UH50 VT62
    
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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 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.
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: Datasheet & 4061. Type 834 was first introduced in 1936.

 

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 PDF datasheet.
Updated April 22, 2013.
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