1F4 @ The Valve Museum

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1F4

Sensibly equivalent^¶ to:

CV767

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Unknown Photographic Donation - Mark Mallison

The 1F4 is a battery audio output valve. It is identical electrically to the 1F5G, the difference being that the 1F5G is on a IO base.

The anode load for use in single ended circuits is 16,000 Ohms. A cathode resistor value is not given.

The base looks more like a B5 than a UX5 - something is wrong. All the data-sheets point to the UX5 base for the 1F4.

Thanks to Mark Mallison for sending the images.

The classic envelope is 43 mm in diameter and, excluding the UX5 base pins, is 96 mm tall.

References: Data-sheet & ¹⁰⁴³. Type 1F4 was first introduced in 1936. See also 1936 adverts.

Pin Connections

UX5	1	2	3	4	5	6	7	8
	nc	f+	a	g2	g1	nc	f-	nc

Absolute Maximum Operating Conditions^¶

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm	Pout	D
	2.0	0.12	135	135	-4.5	8.0	2.4	0.2M	1.7	0.31	5%

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated January 06, 2022.

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