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PM22

Sensibly equivalent to:
220PT 230HPT 230Pen CV3649 PT225 PT240 Pen220A Pen230
See also:
The Philips-Mullard (PM) Series - Mullard PM22 Box - Some Important British Valves
    
Extras ▼

 

The PM22 output pentode was designed for battery operation.
The filament and anode voltages are printed onto the top of the envelope together with the type designation.
The anode load impedance required is 8,000 Ohms.
Additional details can be found on this second data-sheet.
Both four and five pin versions were made, the connections given are for the five pin version.
The balloon envelope is 47 mm in diameter and, excluding the B4 base pins, is 88 mm tall.
References: 1931 datasheet & 1043. Type PM22 was first introduced in 1928.

 

Pin Connections
B4
1
2
3
4
5
a
g1
f(-)
f(+)
g2

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
gm
Pout
2.0
0.2
150
150
-10.0
15
4.0
1.3
0.35W
Thanks to Andy Cowley for supplying the above PDF datasheet.
Updated December21, 2012.
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