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DET3

Sensibly equivalent to:
7886 CV1034 VT34
See also:
CV1034 short entry
    
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The DET3 is a large baloon transmitting triode with a thoriated tungsten filament and operation to 3 MHz. It has an anode dissipation of 250 Watts and is a larger version of the DET2.
The DET3 was designed for RF amplification and the sister valve DEM3 was designed for modulator service. The DET3 was widely used in the amplifier chains of Marconi transmitters including the short-wave SWB8, SWB10 and SWB11. Here it is seen in situ in the medium wave transmitting cabinet at the museum.
In this image the GEC logo can be seen as well as the filament, grid and box anode.
The balloon envelope is 162 mm in diameter, and excluding the leads is 420 mm tall.
References: Datasheet, & 1005.

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
gm
15
4.0
3,000
-1
2,500
9.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 03, 2015.
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