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TH4

 
See also:
Some Important British Valves
    
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The TH4 is a triode hexode mixer dating to 1936. The later variants are: TH4A (1937) and TH4B (1938).
The reverse is plain gold coloured zinc paint.
The classic envelope is 45 mm in diameter, and excluding the B7 base pins is 115 mm tall.
References: Datasheet & 1043. Type TH4 was first introduced in 1936.

 

Pin Connections
B7
1
2
3
4
5
6
7
tc
a(t)
g1(t),g3
g2,g4
h
h
m,k
a
g1

 

Absolute Maximum Operating Conditions
Hexode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
4.0
1.5
250
70
-2
4.0
6.0
1.5M
1.0

 

Absolute Maximum Operating Conditions
Triode
Va
mAa
gm
150
6.0
1.2
Thanks to Andy Cowley for supplying the above PDF datasheet.
Updated August 05, 2015.
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