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X150

Sensibly equivalent to:
6C10 6CU7 ECH42
    
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The X150 is the M-OV Type designation for the Philips/Mullard ECH42. It is a triode hexode mixer in an all glass envelope fitted with a B8A base and designed for radio receivers.
The metal skirt has the locating pip required as the eight pins are equi-spaced around the base. The lettering is Made in Holland. Philips not M-OV manufacture in Holland and so this was made for M-OV by Philips.
Looking through the screen a small structure can be seen near the top - this is the triode oscillator that feeds the hexode mixer below.
The thin glass tube envelope is 20 mm in diameter, and excluding the B8A base pins is 54 mm tall.
References: Data-sheet & 1040. Type X150 was first introduced in 1948.

 

Pin Connections
B8A
1
2
3
4
5
6
7
8
h
a
a(t)
g1(t),g3
g2,g4
g1
k
h

 

Absolute Maximum Operating Conditions
Hexode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.23
250
85
-2.0
3.2
3.75
1.0M
0.71
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated June 21, 2020.
shape:thin.glass.tube construction:all.glass type:triode.hexode age:1940.1950 base:b8a heater:6.3v pins:8 pin:1.h pin:2.a pin:3.a(t) pin:4.g1(t).g3 pin:5.g2.g4 pin:6.g1 pin:7.k pin:8.h
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