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42SPT

Sensibly equivalent to:
CV1444
    
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The 42SPT is a screened pentode that was designed for video amplification in early television receivers. This would be a bandwidth not exceeding 3 MHz. It has a high mutual conductance or μ that is essential for a wideband amplifier. 1040 gives a maximum anode current of 64 mA.
The classic envelope is 58 mm in diameter and, excluding the B7 base pins, is 127 mm tall.
References: 1040 & 1043. Type 42SPT was first introduced in 1937.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
gm
4.0
2.0
250
250
-15
27
15
11
Updated December14, 2012.
shape:classic construction:pinch type:pentode age:1930.1940 base:b7 heater:4.0v pins:7 pin:1.m pin:2.g1 pin:3.g3 pin:4.h pin:5.h pin:6.k pin:7.g2 pin:tc.a
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