6F18 @ The Valve Museum

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6F18

Sensibly equivalent^¶ to:

6EC7 W739

Extras ▼

Mazda G8LSD Valve Collection

The 6F18 is a variable μ HF pentode for use in broadcast receivers at HF or IF.

The side view showing the anode occupies a large part of the envelope.

Inside can just be seen the support for the suppressor grid indicating a true pentode construction.

The thin glass tube envelope is 21 mm in diameter, and excluding the base pins is 48 mm tall.

References: Data-sheet, ¹⁰⁴⁰ & ³⁰⁰². Type 6F18 was first introduced in 1956. See also 1956 adverts.

Pin Connections

B9A	1	2	3	4	5	6	7	8	9
	k	g1	k	h	h	s	a	g2	g3

Absolute Maximum Operating Conditions^¶

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm	μ
	6.3	0.2	175	100	-1.3	12.0	3.5	0.22M	4.4

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated June 26, 2023.

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