PX4 @ The Valve Museum

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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 - Quality Amplifiers - CV1168 short entry - Marconi PX4 & DPT Mains Output Valves Advert - Quality Push-Pull Amplifier

Extras ▼

Osram The Liverpool Collection Other PX4 exhibits

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: Data-sheet, ¹⁰⁰⁵, ¹⁰⁴⁰ & ¹⁰⁴³. Type PX4 was first introduced in 1929. See also 1929 adverts.

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 June 04, 2023.

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