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W1

 
See also:
The Cossor Wuncell Range - Cossor W1 Box - The Early Cossor Tin Hat Valves - Some Important British Valves - Cossor P1, P2, W1, W2 & WR1 Advert
    
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The Cossor W1 is a dull emitter triode and was introduced in 1924 as a replacement for the bright emitter P1. It was intended as a detector and/or audio amplifier.
The base is distinctive with an open area between the pins.
The W1 arrived it its original box and because the glass is silvered the only indication that the valve used the fan shaped anode is on the box. In fact the W1 was made just like the P1 but with an oxide-coated filament.
Like most early valves the operating conditions are printed on the box. Many valves of this period were sold to experimenters and home constructors. Additionally most commercial wireless set construction was carried out by small businesses.
The wide glass tube envelope is 28 mm in diameter, and excluding the B4 base pins is 75 mm tall.
References: 1003 & 1004. Type W1 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
1.8
0.3
120
-3.0
-
19,000
0.38
7.2
Updated May 01, 2013.
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