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X64

Sensibly equivalent to:
ARH1 CV1280 NR67
    
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The X64 is a heptode variable μ mixer. It was the prototype for the UK Government specification for: Navy NR67, Army ARH1 and was finally brought into the CV register as CV1280.
The etched M-OV lozenge.
With some processing the X64 can be read.
The classic envelope is 39 mm in diameter and, excluding the IO base pins, is 98 mm tall.
Reference: Datasheet. Type X64 was first introduced in 1937.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
m
h
a
g2,g4
g3
-
h
k,g5
g1

 

Absolute Maximum Operating Conditions
Heptode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
150
-6.0
3.3
8.3
1M
0.35
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 18, 2019.
shape:classic construction:pinch type:heptode age:1930.1940 base:io heater:6.3v pins:8 pin:1.m pin:2.h pin:3.a pin:4.g2.g4 pin:5.g3 pin:6.- pin:7.h pin:8.k.g5 pin:tc.g1
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