ECC85 @ The Valve Museum

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ECC85

Sensibly equivalent^¶ to:

6AQ8 6L12 B719

See also:

Valves and their Habits

Extras ▼

Mazda G8LSD Valve Collection Other ECC85 exhibits

The ECC85 is the definitive double triode for the front end stages of FM radio receivers. It was designed specifically for the purpose and released in 1954.

This Mazda valve was found in a Philips B4X23A/15 radio and typically was the cause of no reception on VHF.

See also UCC85 and PCC85.

The back plate of the anode is flat with the front plate being shaped to receive the inner electrodes.

The holes in the anode ends reveal the grids within and their copper supports.

Made in England.

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 48 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type ECC85 was first introduced in 1954. See also 1954 adverts.

Pin Connections

B9A	1	2	3	4	5	6	7	8	9
	a(2)	g1(2)	k(2)	h	h	a(1)	g1(1)	k(1)	s

Absolute Maximum Operating Conditions^¶

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	6.3	0.435	250	-2.3	10	9700	5.9

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated October 21, 2020.

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