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X14

Sensibly equivalent to:
1A7G 1A7G DK32
    
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The X14 is a heptode frequency changer designed for battery superhet radio receiver use. The local oscillator is formed between the cathode and grid 2. Grid 1 being the oscillator control grid. The pulsating electron flow is screened by Grid 3 from the oscillator and grid 5 from the anode. In this screened space is the mixer control grid g4. For maximum isolation between oscillator and signal circuits the mixer control grid is taken to the top cap.
The Osram paper label.
As a low power device the anode has been left bright. The filament tension spring can be seen at the top and below the top mica the wire grids can be seen.
The wide glass tube envelope is 28 mm in diameter, and excluding the IO base pins is 87 mm tall.
References: Datasheet, 1040 & 1043. Type X14 was first introduced in 1940.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
s
f+
a
g3,g5
g1
g2
f-
-
g4

 

Absolute Maximum Operating Conditions
Heptode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
1.4
0.05
110
60
-0
0.6
0.7
0.6M
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 12, 2016.
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