CV1284 @ The Valve Museum

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CV1284

Sensibly equivalent^¶ to:

MS/PenT NR71

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Unknown Donation from Jeremy Harmer

The CV1284 is an RF pentode based on the MS/Pen/T. Older service names were the NR71 and the VR129.

See NR71 for more details.

The classic envelope is 44 mm in diameter, and excluding the B7 base pins is 107 mm tall.

Reference: Data-sheet. Type CV1284 was first introduced in 1933. See also 1933 adverts.

Pin Connections

B7	1	2	3	4	5	6	7	tc
	nc	g1	g3	h	h	k	g2	a

Absolute Maximum Operating Conditions^¶

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	4.0	1.0	4,000	125	-2.0	5.4	-	0.6M	2.8

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated October 30, 2025.

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