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Point One - Det & LF

Sensibly equivalent to:
210LF 410LF 610LF
See also:
The Early Cossor Tin Hat Valves - Some Important British Valves - Cossor Point One and Stentor Valves
    
Extras ▼

 

The Cossor Point One Det & LF is described on its black paper label as designed for rectification (signal detection of AM signals) and low frequency amplification.
The electrodes are partially obscured. The basic operating details are on the paper label.
It is possible to make out the shape of the anode. It is similar to that introduced with the W3.
The Cossor Point One range of 1927 preceded the later unified range when the name changed to 210LF.
The balloon envelope is 42 mm in diameter and, excluding the B4 base pins, is 87 mm tall.
References: Datasheet, 1043 & 1040. Type Point One - Det & LF was first introduced in 1927.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
2.0
0.1
120
-4.5
4.8
10,000
1.4
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated August 21, 2017.
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