The VR136 is the pre-CV UK service designation for the commercial EF54. The valve is a VHF high-slope pentode and has a sharp cut-off. The cathode is brought out to several pins to provide a low inductance path, part way to a ring connection as found in co-axial valves. The VR136 has aligned grids to reduce partition noise and was developed from the EF50 during WW2. The VR136 was capable of operation up to 200 MHz.

The all glass construction is covered with an aluminium screening can in the same fashion as the EF50 et al.

The B9G base was one of the first used for all glass construction.

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

 
Pin Connections

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

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.3	0.3	250	250	-1.7	10	1.45	0.5m	7.7

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 17 August 2008 {find valves by name}