6F6G @ The Valve Museum

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6F6G

Sensibly equivalent^¶ to:

ARP17 CV1186 CV1911 KT63 NR85

See also:

CV1186 short entry

Extras ▼

Mullard HMS Collingwood Other 6F6G exhibits

The 6F6G output pentode was designed for audio amplification in radio receivers. The operating values given are for single ended use with an anode load of 7,000 Ohms.

If a pair are used as an audio amplifier in push pull class A, 10.5 Watts are possible with 3% distortion.

The equivalent type KT63 is a beam tetrode. Type 42E is electrically the same but with a UX6 base. Additionally the 7D5 is a 6F6G with a 0.315 Amp 13 Volt heater and a B7 Base cap.

The classic envelope is 42 mm in diameter and excluding the IO base pins the length is 95 mm.

References: Data-sheet, ¹⁰⁴⁰ & ¹⁰⁴³. Type 6F6G was first introduced in 1937. See also 1937 adverts.

Pin Connections

IO	1	2	3	4	5	6	7	8
	m	h	a	g2	g1	nc	h	k

Absolute Maximum Operating Conditions^¶

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm	Pout	D
	6.3	0.7	285	285	-20	38	7	78k	2.55	4.5W	9%

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated January 07, 2022.

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