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X22

Sensibly equivalent to:
210PG CV1043 CV3818 VHT2A VR43
See also:
Osram Valves 'Acoustic Aberation' 1 HF Stage Advert
    
Extras ▼

 

The X22 is a battery heptode or pentagrid mixer for use in broadcast receivers including short wave bands. The valves were metalised for shielding but this exhibit has shed the zinc paint revealing the electrode structure and the original etched lettering. X22 has the metal paint in place.
The pin connections presented come from Thrower as the reference in Radio Valve Data appears to be incorrect.
The pad holding the wire that originally connected the metal loaded paint to base pin six.
A close-up of the bright anode with wire grids within. The filament tension spring is held on a mica sheet above the top mica that holds the electrodes. Signal injection is via g4 that connects to the top cap.
The top mica. The screen grids g3 and g5 are close wound and enclose the signal grid.
The lower mica and pinch.
The classic envelope is 44 mm in diameter, and excluding the B7 base pins is 107 mm tall.
References: Datasheet, 1040 & 1043. Type X22 was first introduced in 1937.

 

Pin Connections
B7
1
2
3
4
5
6
7
tc
g2
g1
g3,g5
f
f
m
a
g4

 

Absolute Maximum Operating Conditions
Heptode
Vh
Ah
Va
Vs
2.0
0.15
150
70
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated November 18, 2015.
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