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DE3

 
See also:
Some Important British Valves - Marconi R, DER & DE3 Advert - Marconi DE3 Advert
    
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This valve is a Marconi DE3 triode from 1924.
The filament is rated at 2.8 Volts at 0.06 Amps, this suggests two dry cells in series as the filament supply, but in fact a 4.5 Volt 'bell' battery would be used with a series rheostat. The filament could thus be maintained at the 'correct' voltage. The valve can be used at LF or HF or as a detector according to the label.
The DE3 was designed for use as a detector or AF amplifier.
The construction is a vertical anode 18 mm long and 5 mm diameter, into which the grid and filament fit coaxially. The filament is a single strand, and the grid is a fine wire helix supported on a side rod through the whole length of the anode.
The wide glass tube envelope is 25 mm in diameter and, excluding the B4 base pins, is 91 mm tall.
References: 4051 & 1003 Type DE3 was first introduced in 1924.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
μ
2.8
0.06
20-80
-4.5
-
22,000
0.32
7.0
PDF scanned from an original document held by the museum
Updated August 10, 2015.
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