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12SA7

Sensibly equivalent to:
CV537
See also:
Pentagrid Converters
    
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The 12SA7 is a pentagrid converter for use as a mixer oscillator in superhet receivers. The design is quoted by RCA as optimised to increase stability.
Westinghouse made this valve in Canada.
The thin metal tube envelope is 25 mm in diameter, and excluding the IO base pins is 50 mm tall.
References: Data-sheet, 1040, 3002 & 1043. Type 12SA7 was first introduced in 1939. See also 1939 adverts.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
g5
h
a
g2,g4
g1
k
h
g3

 

Absolute Maximum Operating Conditions
Heptode
Vh
Ah
Va
Vs
Vg
mAa
ra
12.6
0.15
300
100
-0
14.0
1.0M
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 28, 2014.
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