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Point One - HF

Sensibly equivalent to:
210HF 410HF 610HF
See also:
The Early Cossor Tin Hat Valves - Cossor Point One and Stentor Valves - Cossor 2 Volt Range Advert
    
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The Point One HF from Cossor was so named to showcase their low consumption valves. Later in 1927 Cossor introduced their unified ranges and the Point One HF was renamed as the 210HF where the 2 is the filament voltage and the 01 is the current.
The valve was designed for broadcast radio reception and would be used for the signal stage(s) and the detector. The Point One LF would provide audio amplification.
The distinctive Cossor base fitted with compression pins. Note that the lead-out wires are soldered to the pins at the bottom of the pin.
The balloon envelope is 39 mm in diameter, and excluding the B4 base pins is 82 mm tall.
References: 1043 & 1040. Type Point One - HF was first introduced in 1927. See also 1927 adverts.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
μ
2.0
0.1
120
-1
-
44,000
0.5
20
Updated August 21, 2017.
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