20P4 @ The Valve Museum

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20P4

Sensibly equivalent^¶ to:

CL30

See also:

Valves and their Habits

Extras ▼

Mazda G8LSD Valve Collection Other 20P4 exhibits

The 20P4 is purpose designed as a television line output valve.

In September 1953 Mazda described the 20P4 as having a redesigned g2 with consequent reduction in screen dissipation and increase in power handling on positive pulses. The sensitivity of the valve has also been increased.

The valve can withstand a positive anode surge of 6 kV. The screen grid can dissipate 5 Watts.

The wide glass tube envelope is 28 mm in diameter and, excluding the IO base pins, is 88 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type 20P4 was first introduced in 1953. See also 1953 adverts.

Pin Connections

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

Absolute Maximum Operating Conditions^¶

Beam Tetrode	Vh	Ah	Va	Vs	Pdiss
	38	0.2	400	250	10W

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated January 03, 2022.

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