NR70 @ The Valve Museum

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NR70

Sensibly equivalent^¶ to:

ARP23 CV1124 MS/Pen VR124

See also:

CV1124 short entry

Extras ▼

Unknown The Hampshire Collection

NR70 is a designation of the UK Navy before the introduction of the Common Valve designations in 1941. The CV1124 is the same valve. Electrically the MS/Pen (or MSP4) is the closest commercial type but originally on a B5 base as well as the B7, MS/Pen was released in 1933.

The zinc paint covers the envelope and little more than the top mica is visible.

The classic envelope is 44 mm in diameter, and excluding the B7 base pins is 118 mm tall.

References: Data-sheet & ³⁰⁰².

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	ra	gm
	4.0	1.0	250	125	0.8M	2.8

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated January 05, 2022.

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