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220PT

Sensibly equivalent to:
CV1051 PM22C Pen220A VT51
See also:
Cossor 2 Volt Range Advert
    
Extras ▼

 

The 220PT is a battery output pentode from the 1930s. With the correct anode load of 7500 Ohms this valve can deliver one Watt at 8% distortion.
The screen grid is taken to the side terminal.
The original B4 based 220PT was issued in 1932 with the B5 based version released a year later.
The balloon envelope is 45 mm in diameter, and excluding the B4 base pins is 95 mm tall.
References: Datasheet & 1043. Type 220PT was first introduced in 1932.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
2.0
0.2
150
150
-9
19.0
4.0
-
2.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated August 24, 2015.
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