The 61SPT is a screened pentode, but one with a high current rating. As a screened power RF pentode it may have been designed for use as a driver oscillator.

The classic envelope is 48 mm in diameter, and excluding the IO base pins, is 118 mm tall.

 
Pin Connections

IO	1	2	3	4	5	6	7	8	tc
	-	h	g3	g2	g1	-	h	k	a

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	gm
	6.3	1.27	250	250	-10.5	64.0	15.0	11.0

This exhibit was last updated on 31 January 2004