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215SG

Sensibly equivalent to:
CV1018 CV1048 PM12 S23 S2 SG215 VR18 Z21
See also:
215SG Advert - 215SG 1931 Advert - CV1048 short entry - Cossor 2 Volt Range Advert - Cossor Metalised Valves Advert - Cossor MSG/HA Advert
    
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This exhibit is a Cossor 215SG screen grid valve that Cossor introduced in 1930 and made with there New Process.
It was designed for RF amplification in radio receivers. The screen provides isolation between the grid and anode circuits and enables greater individual stage gains to be achieved without instability.
The anode is formed as two plates either side of the central screening cage. The filament wire can be seen.
The screen was made at this time as a complete cage.
The balloon envelope is 45 mm in diameter, and excluding the B4 base pins is 109 mm tall.
References: Datasheet & 1040. Type 215SG was first introduced in 1929.

 

Pin Connections
B4
1
2
3
4
tc
g2
g1
f
f
a

 

Absolute Maximum Operating Conditions
Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
2.0
0.15
150
80
-1.5
2.5
-
0.3M
1.1
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated September 30, 2019.
shape:balloon construction:pinch type:tetrode age:1920.1930 base:b4 heater:2.0v pins:4 pin:1.g2 pin:2.g1 pin:3.f pin:4.f pin:tc.a
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