Western electric 373 a brochure
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Page 1
BELL SYSTEM PRACTICES SECTION AB46.373A
Transmission Engineering Data Issue 1, May 1950
Vacuum Tube Data A.T.&T. Co, Standard
PENTODE WSW! Electric
DESCRIPTION
The 373A is a filamentary type suppressor grid pentode. It is designed for use as an audio,
carrier or radio-frequency voltage amplifier, oscillator or modulator.
CHARACTERISTICS
Filament Voltage, A-C . . a . . . . . . . . . 2.0 volts
Plate Current . . . . Eb : E02 2 150 volts; . . 2 milliamperes
Transconductance . . . Ed : -3 volts; Eca = 0 . . 1280 micromhos
ELECTRON TUBE DATA SHEET
FILE: GENERAL PURPOSE SECTION
1w 373A
PENTODE
Page 2
373A - PAGE 2
GENERAL CHARACTERISTICS
ELECTRICAL DATA
Filament Voltage, A-C
Filament Current . . . .
Direct Interelectrode Capacitances
Grid to Plate (maximum)
Input
Output .
MECHANICAL DATA
Cathode
Bulb
Base , ,
Mounting Position ,
2.0 volts
250 milliarnperes
0.07 uuf
5.9 uuf
5.0 uuf
Coated Filament
. . T11
Short intermediate shell, 7-pin octal
Vertical - or horizontal with plane
of filament vertical.
Dimensions and pin connections shown in outline drawing on Page 4
MAXIMUM RATINGS, Design-Center Values
Plate Voltage . , .
Screen Grid Voltage .
Plate Dissipation . . ,
Screen Grid Dissipation .
TYPICAL OPERATING CONDITIONS AND
Filament Voltage, A-C .
Plate Voltage
Screen Grid Voltage
Control Grid Voltage
Suppressor Grid Voltage
Plate Current
Screen Grid Current .
Peak A-F Signal Voltage .
Plate Resistance
Transconductance
Load Resistance .
Power Output .
Total Harmonic Distortion.
Control Grid Voltage, Approximate,
for 10 Microamperes Plate Current .
250 volts
150 volts
2 watts
0.45 watt
CHARACTERISTICS
2.0 2.0 volts
150 250 volts
150 150 volts
-3 -3 volts
0 0 volts
2.0 2.1 milliamperes
0.47 0.45 milliampere
2 2 volts
1.5 2.0 megohms
1280 1310 micromhos
100000 250000 ohms
120 160 milliwatts
8.5 7.8 per cent
-7.0 -7.4 volts
1. Pin #6 is connected internally to pin #5 and is approximately 3/32 inch shorter
than the other pins to minimize noise when changing tubes while in service.