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P220

Sensibly equivalent to:
AR5 CV3620
See also:
1929 Advert - MAZDA HL2 S215VM Pen220 Pen220A P220 & P220A Advert
    
Extras ▼

 

The P220 triode from Mazda is a low wattage audio output valve for battery radio receivers. The load impedance is 10,000 Ohms and the power output is given as 180 mW.
The dome of the envelope carries the identification etched into the glass.
The getter carrier is attached to the side of the anode. The anode is bright with ridges pressed into the thin sheet to give dimensional stability. The filament tension springs sit on a second mica sheet. Neither of the micas fit tight to the glass.
With a single grid the anode is much wider than the front to back dimension.
The balloon envelope is 39 mm in diameter, and excluding the B4 base pins is 92 mm tall.
References: Datasheet & 1043. Type P220 was first introduced in 1929.

 

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
5.5
3.4
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 10, 2015.
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