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Sensibly equivalent to:
CV1156 NR18
See also:
Some Important British Valves - Which Valve Shall I Buy? - 1924: Hints on Using Dull Emitter Valves
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The DEQ was introduced in 1923, and was intended to replace the Q and QV. The construction is similar to the Q. The filament is a single wire running the length of the envelope and tensioned by a spring at the end opposite the anode and grid supports.
An image in the 1924 article referenced above shows the DEQ fitted to a frame with a standard B4 base.
The anode and grid connections on the envelope pass to a shaped piece of glass rod that supports the electrodes. The grid helix is clearly visible in the picture above. A distinctive feature of the DEQ is the green band of paint around the centre of the envelope.
The DEQ is a very high impedance valve and its primary function was as a detector.
The thin glass tube envelope is 17 mm in diameter and, tip to tip measures 73 mm.
References: 1003 & 1004. Type DEQ was first introduced in 1923. See also 1923 adverts.


Absolute Maximum Operating Conditions
Updated August 06, 2019.
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