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P650

 
See also:
1929 Advert - Some Important British Valves
    
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The P650 from Mazda is an early output triode. The design dates from 1929 and the P650 was obsolete by 1933.
The detail picture shows the grid, filaments and associated supporting structures. The anode is made of bright Nickel sheet and is equipped with additional fins. The electrode structure is not too far dissimilar from the successful power valves of the era such as PX4.
The balloon envelope is 55 mm in diameter, and excluding the B4 base pins, is 132 mm tall.
Reference: 1043. Type P650 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
ra
gm
Pout
6.0
0.5
200
-40
22
1300
2.7
1.1W
Updated April 30, 2013.
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