AC/SP3 @ The Valve Museum

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AC/SP3

Sensibly equivalent^¶ to:

CV2823 TSP4

See also:

Mazda AC/SP3 Advert - Mazda AC/SP3 Advert - Mazda AC/SP3 Advert - Mazda AC/SP3 Advert - Mazda AC/SP3 Advert

Extras ▼

Mazda Valves from Mark Cunliffe

The AC/SP3 is an indirectly heated HF pentode that employs the old UK standard heater rating of 4 Volts at 1 Amp. Mazda give the use as for Short Wave receivers and Television Sets and as a video amplifier it can modulate a cathode-ray tube. The advert states that the AC/SP3 features a special heater construction to reduce induced mains hum and making it suitable for the early stages of amplifiers.

The valve was graded on test into premium low hum A valves and the rest as grade B - fine for normal use. This exhibit has an A on the envelope.

The reverse is left as plain screening paint.

The classic envelope is 39 mm in diameter, and excluding the B7base pins is 111 mm tall.

References: Data-sheet & ¹⁰⁴³. Type AC/SP3 was first introduced in 1937. See also 1937 adverts.

Pin Connections

B7	1	2	3	4	5	6	7	tc
	m	a	g3	h	h	k	g2	g1

Absolute Maximum Operating Conditions^¶

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	gm
	4.0	1.3	200	100	-2.5	8.0	1.5	4.7

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated January 05, 2019.

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