EH90 @ The Valve Museum

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EH90

Sensibly equivalent^¶ to:

6CS6

See also:

Valves and their Habits - Locked Oscillator Discriminator - New TV Valves and Circuits - Mazda TV Valves advert

Extras ▼

Mazda G8LSD Valve Collection Other EH90 exhibits

The EH90 is an indirectly heated heptode frequency converter. It was also used in the 1960's as an FM demodulator for 6 MHz inter-carrier TV sound.

See EH90 for full details.

The side view of the anode shows the wire grids. The rods visible either side of the centre above the top mica are the g3 supports.

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

References: Data-sheet & ¹⁰⁴⁰. Type EH90 was first introduced in 1954. See also 1954 adverts.

Pin Connections

B7G	1	2	3	4	5	6	7
	g1	k,g5	h	h	a	g2,g4	g3

Absolute Maximum Operating Conditions^¶

Heptode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.3	0.3	100	30	-1	0.75	1.1	1M	0.95

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated February 07, 2019.

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