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CV137

Sensibly equivalent to:
EAC91
    
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The CV137 is a miniature diode triode and the prototype was the Mullard EAC91. Note that unlike most diode triode combinations the diode has a separate cathode.
The design function was as a triode oscillator and frequency changer operating at up to 300 MHz. The proposed circuit is included on the data-sheet.
This exhibit has very little internal gettering. The getter holder is a straight section of semi-circular cross section held above the top mica. The top of the envelope is painted green.
The glass has this thick O printed on it.
The electrodes: diode on the left and triode on the right.
A clearer view of the triode and also the getter carrier.
The thin glass tube envelope is 18 mm in diameter, and excluding the B7G base pins is 47 mm tall.
Reference: Datasheet. Type CV137 was first introduced in 1947.

 

Pin Connections
B7G
1
2
3
4
5
6
7
a(d)
k(d)
h
h
k
g1
a

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
μ
6.3
0.3
300
-2.8
11.0
12.8k
2.8
36
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated June 24, 2018.
shape:thin.glass.tube construction:all.glass type:diode.triode age:1940.1950 base:b7g heater:6.3v pins:7 pin:1.a(d) pin:2.k(d) pin:3.h pin:4.h pin:5.k pin:6.g1 pin:7.a
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