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4THA

Sensibly equivalent to:
A36C AC/TH1 X41
    
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The 4THA is a triode hexode frequency changer. The triode is employed as the local oscillator and the hexode for the mixing process. The input signal being coupled to the control grid via the top cap for maximum separation of the anode and grid circuits.
The reverse is plain zinc paint.
The classic envelope is 44 mm in diameter and, excluding the B7 base pins, is 114 mm tall.
References: Data-sheet & 1043. Type 4THA was first introduced in 1938. See also 1938 adverts.

 

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
1.3
250
100
-3
3.0
6.0
1.6
0.75

 

Absolute Maximum Operating Conditions
Triode
Va
mAa
80
4.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 17, 2014.
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