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X109

 
    
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The X109 is a triode hexode mixer for operation at up to 100 MHz and designed for circuits with series heater chains as found in receivers for use on both AC and DC mains. In the UK a DC mains supply still existed in some places at the end of the 1950s and a few isolated areas had DC mains into the 1960s.
The Marconi paper label on this M-OV made valve. Marconiphone was a consumer brand.
The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins is 48 mm tall.
References: Datasheet & 1040. Type X109 was first introduced in 1951.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
g2,g4
g1
k
h
h
a
g1(t),g3
a(t)
-

 

Absolute Maximum Operating Conditions
Hexode
Vh
Ah
Va
Vs
Vg
mAa
19
0.1
250
100
-1
10.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 09, 2017.
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