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PX4

Sensibly equivalent to:
4XP AC044 CV1168 LP4 NR44 P12/250 P460 PP3/250 S30C S30G
See also:
The Azide Process - Osram Advert - Osram KT2, KT76, KT33C, KT66, KT61, KT66, PX4 & PX25 Advert - Osram KT2, KT63, KT61, KT66, PX4, U50, KT76, KT33C, KT71, U76 & U31 Advert - Valves for Power Amplification Advert - CV1168 short entry
    
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The PX4 is one of the classic audio power triode valves and was first introduced in 1929. The filament is a single wire formed vertically within the anode cavity into four inverted V's. The grid is a single wire formed between two vertical notched rods 1.5 mm in diameter. The grid zig-zags around the filament.
See also PX4.
The electrode system is only about 5 mm from front to back, but is 30 mm wide and 45 mm high.
The classic envelope is 48 mm in diameter, and excluding the B4 base pins is 120 mm tall.
References: Datasheet, 1005, 1040 & 1043. Type PX4 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
rk
rl
Pout
D
4.0
1.0
300
-50.0
50.0
830
6.0
1000
3500
4.5
4.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 05, 2015.
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