The 20P1 is a purpose designed self oscillating television line output valve. It is designed to withstand a positive anode surge voltage of 6 kV and a negative grid surge of -1.5 kV. The screen grid can dissipate 5 W.

This valve would be seen in television receivers of the 1950s.

See 20P1 for the original classic envelope version. Although a more modern design, possibly for replacement use, the valve is still assembled on a standard pinch.

The wide glass tube envelope is 29 mm in diameter and, excluding the IO base pins, is 90 mm tall.

 
Pin Connections

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

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Pdiss
	38	0.2	400	250	15W

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This exhibit was last updated on 12 March 2006