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215SG

Sensibly equivalent to:
CV1018 CV1048 PM12 S23 S2 SG215 VR18 Z21
See also:
1929 Advert - The SG Valve - CV1018 short entry
    
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The Mazda 215SG is a screen grid valve or tetrode. 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.
Our other Mazda 215SG is fully metalised.
The other side of the envelope is not silvered and the electrodes are visible. Note the rectangular anode and concentric grids whilst still having the bakelite top cap assembly of the early 1930s.
The balloon envelope is 42 mm in diameter, and excluding the B4 base pins is 110 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
μ
2.0
0.15
150
80
-1.5
7.0
-
0.3M
1.1
330
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 03, 2015.
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