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TH41

Sensibly equivalent to:
CV1411
See also:
Ediswan Advert, December 1948
    
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The TH41 is a triode heptode mixer for mains receivers. The data-sheet says that it was specifically designed for 'all-wave' receivers ie including short wave up to 30 MHz.
The pin-out matches that of the the TH233 (200mA heater for series heater chains) but the mutual conductance is much higher.
The reverse is plain zinc paint external screening.
The classic envelope is 32 mm in diameter, and excluding the MO base pins is 93 mm tall.
References: Datasheet, 1040 & 1043. Type TH41 was first introduced in 1939.

 

Pin Connections
MO
1
2
3
4
5
6
7
8
tc
h
k
a
a(t)
g1(t),g3
m
g2,g4
h
g1

 

Absolute Maximum Operating Conditions
Heptode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
4.0
1.3
250
250
-3
3.0
6.0
1.6M
3.1
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 14, 2017.
shape:classic construction:pinch type:triode.heptode age:1930.1940 base:mo heater:4.0v pins:8 pin:1.h pin:2.k pin:3.a pin:4.a(t) pin:5.g1(t).g3 pin:6.m pin:7.g2.g4 pin:8.h pin:tc.g1
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