The L63 was an Octal based amplifier triode from M-OV in the late 1930s. It featured the then new standard 6.3 Volt heater. This was a low power heater insulated with alumina.

The L63 was a 'me too' straight copy of the American 6J5, intended initially for overseas markets where American-type valves were in demand. However, it was used in Britain too, especially by manufacturers of export equipment. It was never intended for UK domestic radios.

The ML4, already available in a 6V version (ML6, or ML6C for SW oscillators), was far superior to the L63.

The wide glass tube envelope is 28 mm in diameter and, excluding the IO base pins, is 83 mm tall.

 
Pin Connections

IO	1	2	3	4	5	6	7	8
	m	h	a	-	g1	-	h	k

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	6.3	0.3	250	-8	9.0	7,700	2.6

Thanks to Frank Philipse for supplying the above datasheet

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This exhibit was last updated on 08 June 2007 {find valves by name}