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VR18

Sensibly equivalent to:
215SG CV1018 Z21
    
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The VR18 (later the CV1018) is a screened grid valve based on the Mazda 215SG.
The reverse: plain zinc screening paint and maker code.
The screw top cap was not used after the mid 1930s.
References: Data-sheet & Data. Type VR18 was first introduced in 1935. See also 1935 adverts.

 

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 January 19, 2023.
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