The 63SPT was A C Cossor's type designation number for the EF50s that it made. The valve was so important during WW2 that several manufacturers were involved although the design was a breakthrough for Philips in The Netherlands.

The wide metal tube envelope is 32 mm in diameter and, excluding the B9A base pins, is 60 mm tall.

 
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

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This exhibit was last updated on 24 February 2005