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7B7

Sensibly equivalent to:
CV522 W149
See also:
American Loctal Valves
    
Extras ▼

 

The 7B7 is a high impedance variable μ amplifier pentode. It was designed for RF & IF amplifier use, with a tuned anode circuit. This exhibit has no Type designation visible but it came in a plain box with the Type printed on it.
The small gap at the base of the anode reveals the suppressor grid.
At the base the cathode, heater and grid supports can be seen.
The wide glass tube envelope is 29 mm in diameter and, excluding the B8B base pins, is 57 mm tall.
References: Datasheet & 1040.

 

Pin Connections
B8B
1
2
3
4
5
6
7
8
h
a
g2
g3
s
g1
k
h

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.15
250
100
-3
8.5
1.7
0.75M
1.75
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December05, 2017.
shape:wide.glass.tube construction:all.glass type:pentode age:1940.1950 base:b8b heater:6.3v pins:8 pin:1.h pin:2.a pin:3.g2 pin:4.g3 pin:5.s pin:6.g1 pin:7.k pin:8.h
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