834 @ The Valve Museum

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834

Sensibly equivalent^¶ to:

304A 3T50 4304CA BW11 CV1062 DET12 NT58 TY1-50 UH50 VT62

Extras ▼

RCA The John Lawrence Collection Other 834 exhibits

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.

Pin Connections

UX4	1	2	3	4	tc	tc
	f+	nc	nc	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 January 04, 2022.

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