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AC/SG

Sensibly equivalent to:
8A1 AC/S2Pen CV1164 CV2822 HP4101C MS/Pen MSP4 SP4 SPT4A
See also:
Mazda 1929 Valve Range Advert - Mazda AC Valves advert - Mazda Brand advert - Some Important British Valves
    
Extras ▼

 

The Mazda AC/SG is and AC heated Screen Grid or tetrode amplifier for RF use. It was made in both clear and metalised versions. The internal structure can be seen on the clear version.
The heater is the then UK standard of 4.0 Volts at 1.0 Amp. The top-hat top cap arrived in the mid 1930's. The first versions had screw metal caps and later production the black moulded screw top caps.
The balloon envelope is 45 mm in diameter, and excluding the B5 base pins is 105 mm tall.
References: 1040 & 1043. Type AC/SG was first introduced in 1929.

 

Pin Connections
B5
1
2
3
4
5
tc
g2
g1
h
h
k
a

 

Absolute Maximum Operating Conditions
Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
4.0
1.0
200
60
-1.5
4.5
0.8
0.9M
1.9
Updated August 05, 2015.
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