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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
    
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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: Datasheet & 1043. Type AC/SP3 was first introduced in 1937.

 

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 March 28, 2017.
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