CV784 @ The Valve Museum

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CV784

Sensibly equivalent^¶ to:

1FD9 1S5 DAF91 ZD17

Extras ▼

Unknown Donation from Jeremy Harmer

The CV784 is a diode pentode valve that was designed for battery portable radio receivers and is identical to the commercial 1S5.

The filament leaves the top mica and then passes through a small flag-like piece of metal. This is the single diode.

The diode end on has a small separation between the sides.

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 CV784 was first introduced in 1947. See also 1947 adverts.

Pin Connections

B7G	1	2	3	4	5	6	7
	f-	nc	a(d)	g2	a	g1	f+

Absolute Maximum Operating Conditions^¶

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	1.4	0.05	67.5	67.5	0	1.6	0.4	0.6M	0.63

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated March 27, 2021.

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