NR74 @ The Valve Museum

NR74

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

Beam Tetrode	Vh	Ah	Va	Vs	Vg	mAa	mAs	gm
	4.0	1.75	310	210	-6.9	63	14	8.5

Beam Tetrode	Pdriv	Pout	freq	f.max
	1.0W	73W	20MHz	60MHz

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NR74

Sensibly equivalent¶ to:

AC6/Pen CV1189 PV1-35

See also:

CV1189 short entry

Extras ▼

This valve is classified as part of the NR series of pre WWII Naval Receiving valves.

This valve is equivalent to the commercial AC6/Pen and was designed for timebase output in early TVs and oscilloscopes. The cathode resistor is given as 90 Ω.

The classic envelope is 48 mm in diameter and, excluding the B7 base pins, is 118 mm tall.

References: Data-sheet & 1043. Type NR74 was first introduced in 1938. See also 1938 adverts.

Pin Connections

B7

1

2

3

4

5

6

7

tc

nc

g1

g2

h

h

k

nc

a

Absolute Maximum Operating Conditions¶

Beam Tetrode

Vh

Ah

Va

Vs

Vg

mAa

mAs

gm

4.0

1.75

310

210

-6.9

63

14

8.5

Absolute Maximum Operating Conditions¶

Beam Tetrode

Pdriv

Pout

freq

f.max

1.0W

73W

20MHz

60MHz

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated January 04, 2022.

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Sensibly equivalent^¶ to:

References: Data-sheet & ¹⁰⁴³. Type NR74 was first introduced in 1938. See also 1938 adverts.

Absolute Maximum Operating Conditions^¶

Absolute Maximum Operating Conditions^¶