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X66

Sensibly equivalent to:
CV1099 CV3828 VR99
    
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The X66 is a selected X65 and also known as CV1099. It is a triode hexode mixer or frequency changer.
The CV1099 also appears on the envelope.
The Marconi paper label.
The top cap connects to the control grid of the hexode. Grids two and four (screens) are strapped together above the top mica. Grid three is connected internally to the grid of the triode that is mounted above the pinch.
The classic envelope is 38 mm in diameter, and excluding the base pins is 96 mm tall.
References: Data-sheet & 1043. Type X66 was first introduced in 1940.

 

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

 

Absolute Maximum Operating Conditions
Hexode
Vh
Ah
Va
Vs
Vg
mAa
ra
gm
6.3
0.3
250
100
-3
1.75
2.5M
0.225

 

Absolute Maximum Operating Conditions
Triode
Va
mAa
100
4.75
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated September 23, 2020.
shape:classic construction:pinch type:triode.hexode age:1940.1950 base:io heater:6.3v pins:8 pin:1.m pin:2.h pin:3.a pin:4.g2.g4 pin:5.g1(t).g3 pin:6.a(t) pin:7.h pin:8.k pin:tc.g1
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