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DEQ

Sensibly equivalent to:
CV1156 NR18
See also:
Some Important British Valves - Which Valve Shall I Buy?
    
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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.
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.

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
3.0
0.2
Updated May 20, 2015.
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