The VR137 was specified for VHF low power transmitter use and the commercial name is EC52. The anode dissipation is 7 Watts and the full power frequency rating is 300MHz. The maximum frequency that useful power could be obtained was 400MHz.

The envelope is clearly able to accommodate a pair of these small electrode systems. The valve is a thin flat arrangement on one side of the envelope.

As with all valves produced in the early days of the glass disc base the pins are short and equi-spaced around a circle. The evacuation seal is concealed within a metal spigot that enables the valve to be accurately located within the valveholder.

The wide glass tube envelope is 30 mm in diameter and, excluding the B9G base pins, is 58 mm tall.

 
Pin Connections

B9G	1	2	3	4	5	6	7	8	9
	h	g	k	a	nc	nc	nc	nc	h

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa	ra	gm	Pdiss	freq	f.max
	6.3	0.43	250	-2.6	10	9.2k	6.5	7W	300	400.

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This exhibit was last updated on 06 August 2006