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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 M-OV ellipse on the glass contains the X66 identification but the image is very feint.
The thin internal coating allows the general layout of the electrodes to be seen.
A little extra back light and some post shoot processing improves the resolution somewhat. The triode is below the middle mica and the mixer is above.
The classic envelope is 38 mm in diameter, and excluding the base pins is 99 mm tall.
References: Data-sheet & 1043. Type X66 was first introduced in 1940. See also 1940 adverts.

 

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 March 18, 2024.
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