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6F7B

 
    
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The 6F7B is a variant of the 6F7 triode pentode mixer. The triode oscillator has to generate 7.0 Volts pk-pk to drive the mixer section.
Both sections share a common cathode. The screened upper cylinder is the pentode mixer. The small bright tab below is the triode anode. Under a glass the triode grid can be seen. The cathode tube is oxide coated only along the length of each anode, above the triode anode the tube is un-coated.
The classic envelope is 38 mm in diameter, and excluding the UX7 base pins is 103 mm tall.
Reference: 1043. Type 6F7B was first introduced in 1940.

 

Pin Connections
UX7
1
2
3
4
5
6
7
tc
h
a
g2
a(t)
g1(t)
k
h
g1

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
100
-3.0
2.8
0.6
2M
0.3

 

Absolute Maximum Operating Conditions
Triode
Va
Vg
mAa
100
-
2.4
Updated June 22, 2013.
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