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KF35

 
    
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The KF35 is a variable μ pentode for battery radio equipment. The KF35 would have been used for mainly IF amplification and the gain would be controlled by the AGC line altering the negative grid bias. The control grid was taken to the top cap to minimise the interaction of the grid and anode circuits.
This exhibit is unusual in that the Mullard name is present but not within the standard logo.
The reverse is plan metal loaded screening paint.
The envelope is 32 mm in diameter and, excluding the IO base pins, is 82 mm tall.
References: 1951 Datasheet & 1040. Type KF35 was first introduced in 1946.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
m
f+
a
g2
g3
-
f-
-
g1

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
2.0
0.05
120
60
-1.5
1.45
0.5
1.5M
1.08
PDF scanned from an original document held by the museum
Updated August 22, 2018.
shape:wide.glass.tube construction:pinch type:pentode age:1940.1950 base:io heater:2.0v pins:8 pin:1.m pin:2.f+ pin:3.a pin:4.g2 pin:5.g3 pin:6.- pin:7.f- pin:8.- pin:tc.g1
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