W25 @ The Valve Museum

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W25

Sensibly equivalent^¶ to:

1AJ4 1F1 DF96

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GEC Thomas Tough Valve Collection.

The W25(DF96) is an amplifier pentode for use in battery portable radio equipment, mainly domestic broadcast receivers.

By 1954 the transistor was the next approaching technology and valve makers responded with a range of 25 mA filament valves to keep sales of the valve portable alive.

This exhibit is an import as the word Foreign denotes.

The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 47 mm tall.

References: Data-sheet. Type W25 was first introduced in 1953. See also 1953 adverts.

Pin Connections

B7G	1	2	3	4	5	6	7
	f-,g3	a	g2	ic	f-,g3	g1	f+

Absolute Maximum Operating Conditions^¶

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	1.4	0.025	85	64	0	1.65	0.55	1M	0.85

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated June 15, 2024.

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