VR91 @ The Valve Museum

▼ Menu

Home Search Indexes Equivalents Articles Adverts & Boxes Timeline Collections Donate Contact

VR91

Sensibly equivalent^¶ to:

ARP35 CV1091 EF50

See also:

The Famous EF50 of WWII

Extras ▼

Rogers G8LSD Valve Collection Other VR91 exhibits

The WWII EF50 in a plain aluminium screening can and carrying the UK Air Ministry branding. The VR91 is Valve Receiving number 91.

This amplifier pentode was a general workhorse. It was extensively used in radio and radar during WWII.

The pins are equi-spaced around the circumference of the pin circle.

The lettering on this example has the Air Ministry initials and crown unlike our other Rogers VR91.

This example was made in Canada by Rogers.

The wide glass tube envelope is 32 mm in diameter and, excluding the B9G base pins, is 60 mm tall.

References: ¹⁰⁴⁰. Type VR91 was first introduced in 1938. See also 1938 adverts.

Pin Connections

B9G	1	2	3	4	5	6	7	8	9
	h	g2	a	g3	s	k	g1	s	h

Absolute Maximum Operating Conditions^¶

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.3	0.3	250	250	-2	10	3	1.0M	6.5

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated December03, 2012.

Return to Main Index