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202VPB

 
    
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The 202VPB is a variable-μ amplifier pentode designed for RF or IF amplification in superhet receivers where the stage gain is controlled by an AGC voltage derived from the rectified signal.
The 202VPB and 202VP are electrically identical, the difference being that for the 202VP the top cap connection is the anode.
The heater is designed to draw 200 mA at approximately 20.0 Volts and be connected as part of a heater chain across the mains supply either AC or DC.
See also 202STH for the box for this exhibit.
Thanks to Alan Stepney for the images.
The classic envelope is 44 mm in diameter, and excluding the B7 base pins is 109 mm tall.
References: 1040 & 1043. Type 202VPB was first introduced in 1938.

 

Pin Connections
B7
1
2
3
4
5
6
7
tc
M
a
g3
h
h
k
g2
g1

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
20.0
0.2
250
100
-1.5
4.3
1.3
0.6M
2.2
Updated December14, 2012.
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