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X65

Sensibly equivalent to:
CV1193 CV3826 ECH35 NR82 OM10 VR99 X147 X61M X61M
See also:
Osram X65 Advert - X65 Instruction Sheet
    
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The X65 is a triode hexode. The X65 is the commercial version of the RAF pre WWII VR99 and both designations are on the glass.
The triode was designed for local oscillator use and an injection voltage of 10 V peak to peak was produced. The hexode mixer took the signal into the top cap grid, thus maintaining the greatest separation between grid and anode circuits.
At the top can be seen the grid supports. The screening grids are connected together. The triode is at right angles below the mixer on a common cathode. The top cap connection to g1 is also strapped by tape to g3. This looks to be different to the given information.
The classic envelope is 39 mm in diameter and, excluding the IO base pins, is 99 mm tall.
References: Data-sheet & 1040. Type X65 was first introduced in 1937. See also 1937 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 01, 2022.
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