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PP225

Sensibly equivalent to:
BL22
    
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The PP225 is a battery audio output pentode from the mid 1930s.
Side view of the bright anode.
The filament is formed into an M. The control grid wires have been pinched together on the inside of the supports and pass flat across the filament. Grid three seems to just consist of the two vertical supports.
The classic envelope is 38 mm in diameter and, excluding the B5 base pins, is 91 mm tall.
Reference: 1043. Type PP225 was first introduced in 1936.

 

Pin Connections
B5
1
2
3
4
5
a
g1
f-
f+
g2

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
rl
Pout
2.0
0.265
135
135
-12.0
18.0
2.0
6,000
0.8W
Updated August 20, 2019.
shape:classic construction:pinch type:pentode age:1930.1940 base:b5 heater:2.0v pins:5 pin:1.a pin:2.g1 pin:3.f- pin:4.f+ pin:5.g2
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