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TP22

Sensibly equivalent to:
CV1344
See also:
Some Important British Valves
    
Extras ▼

 

The TP22 is a battery triode variable μ pentode frequency changer or mixer. The triode section is designed to fulfill the function of local oscillator.
The makers lettering is still in place but most of the zinc paint screening has fallen off revealing the construction.
The triode anode is bright with ridges pressed into the metal to confer strength.
Here the triode is on the right and it has a small front to back depth of 4 mm. The larger pentode has an oval anode.
The pentode anode is also ribbed for strength.
The coiled filament tension springs of both sections can clearly be seen. A single spring for the triode and two springs for the pentode.
The classic envelope is 45 mm in diameter, and excluding the B9 base pins is 109 mm tall.
References: Datasheet, 1040 & 1043. Type TP22 was first introduced in 1934.

 

Pin Connections
B9
1
2
3
4
5
6
7
8
9
tc
g2
a
g3
f
f
-
a(t)
g1(t)
m
g1

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
2.0
0.25
150
150
-1
1.2
0.4
1.6M
1.3
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated August 05, 2015.
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