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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 - Some Important British Valves - Osram KT2, KT76, KT33C, KT66, KT61, KT66, PX4 & PX25 Advert - Osram PX4, PX25 & KT66 Advert - CV1168 short entry
    
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The PX4 is one of the classic audio power triode valves and this one is branded Marconi. The design belongs to M-OV and so Marconi and Osram are used to brand the valves.
This exhibit lacks the treated anode of later versions and features a bright nickel anode.
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.
The electrode system is only about 5 mm from front to back, but is 35 mm wide (including support rods) and 45 mm high. The classic envelope has a maximum diameter of 58 mm and excluding the B4 base pins, is 120 mm long. See also PX4 and PX4.
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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