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1C2

Sensibly equivalent to:
1AC6 DK92 X18 X20
See also:
Pentagrid Converters
    
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The 1C2 is a miniature heptode frequency changer for use in dry battery powered radio receivers. Domestic long and medium wave receivers would have this as the mixer to produce a 455 kHz IF from the incoming signal. It can be used with a separate oscillator, but was probably designed as a self oscillating mixer, in the manner of other pentagrid converters.
The operating parameters for the triode section refer to the oscillator formed between the inner grids of the heptode.
The thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 45 mm tall.
References: Datasheet & 1040. Type 1C2 was first introduced in 1952.

 

Pin Connections
B7G
1
2
3
4
5
6
7
f+
a
g2
g1
g4
g3
f-,g5

 

Absolute Maximum Operating Conditions
Heptode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
1.4
0.05
85
60
0
0.7
0.15
0.65M
0.325

 

Absolute Maximum Operating Conditions
Triode
Va
mAa
35
1.6
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 18, 2013.
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