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P220A

 
See also:
MAZDA HL2 S215VM Pen220 Pen220A P220 & P220A Advert - Mazda 2 Volt Range Advert - Valves for Your Set
    
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The P220A triode from Mazda is a low wattage audio output valve for battery radio receivers. The load impedance is 4,100 Ohms and the power output is given as 350 mW. It is the bigger brother to the P220.
The identification on the dome.
Thanks to Mark Mallison for sending the images.
The balloon envelope is 45 mm in diameter, and excluding the B4 base pins is 91 mm tall.
References: Datasheet, 1040 & 1043. Type P220A was first introduced in 1931.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
gm
2.0
0.2
150
-7.0
17.0
3.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated November 02, 2018.
shape:balloon construction:pinch type:triode age:1920.1930 base:b4 heater:2.0v pins:4 pin:1.a pin:2.g1 pin:3.f pin:4.f
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