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CBL31

Sensibly equivalent to:
CV1463
    
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The Mullard CBL31 dates from 1938 and was designed for low cost superhet broadcast receivers mainly for local station use. The diodes function as AGC rectifier and signal detector (demodulator of AM signals) whilst the high gain pentode amplifies the detected signal and drives the loud speaker.
See also CBL1, CL4 and CL33.
The anode, although not clear, has side flanges that radiate heat and attach to the supports the enclosed space is oval in shape.
The classic envelope is 44 mm in diameter, and excluding the IO base pins is 119 mm tall.
References: Datasheet & 1043. Type CBL31 was first introduced in 1938.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
m
h
a
a(d2)
a(d1)
g2
h
k
g1

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
rk
rl
Pout
D
44.0
0.2
200
200
-8.5
45.0
6.0
35,000
8.0
167
4,500
4.0W
10%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December01, 2012.
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