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DE5

Sensibly equivalent to:
CV2891
See also:
The Dawn of Broadcasting in the UK - Osram DE5 box
    
Extras ▼

 

The DE5 is a dull emitter triode designed to be used as an audio output valve to drive small loud speakers.
The DE5 was introduced in late 1924 and carries the BBC stamp of that period. In 1925 M-OV released the DE5A. This had a lower impedance and therefore could deliver a greater output power.
The structure of the grid can be seen in the photograph above.
See also DE5, DE5A and DE5B
The balloon envelope is 52 mm in diameter, and excluding the B4 base pins, is 100 mm tall.
References: 4051 & 1003 Type DE5 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
5.0
0.25
120
-6
5.4
8000
0.88
PDF scanned from an original document held by the museum
Updated November 14, 2016.
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