Western electric 374 a brochure
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Page 1
BELL SYSTEM PRACTICES SECTION AB46.374A
Transmission Engineering Data Issue 1, May 1950
Vacuum Tube Data A.T,&Tr Co, Standard
.A.
PENTODE "@5122! Electric '
DESCRIPTION
The 374A is a filamentary type suppressor grid power pentode. It is designed for use as
an audio-frequency power amplifier or as an oscillator.
CHARACTERISTICS
Filament Voltage, A-C . . r . , . . . . . . . 3.0 volts
Plate Current I . r _ . . 24 milliamperes
Transconductance Eb : Ec2 = 150 volts; 3400 micromhos
Power Output Ed 2 ~18 volts; Ecg = 0 . 2.0 watts
ELECngg TUBEPDATA SHEET
FILE: ERAL URPOSE SECTION
374A
PENTODE
Page 2
374A - PAGE 2
GENERAL CHARACTERISTICS
ELECTRICAL DATA
Filament Voltage, A-C .
Filament Current . .
Direct Interelectrode Capacitances
Grid to Plate
Input .
Output
MECHANICAL DATA
Cathode
Bulb
Basel . .
Mounting Position
3.0 volts
0.53 ampere
0.18 nut
92 uui
6.5 uui
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 6
MAXIMUM RATINGS, Design-Center Values
Plate Voltage .
Screen Grid Voltage
Plate Dissipation . .
Screen Grid Dissipation ,
150 volts
150 volt:
4.8 watts
1.0 watt
TYPICAL OPERATING CONDITIONS AND CHARACTERISTICS
Filament Voltage, A-C
Plate Voltage . .
Screen Grid Voltage .
Control Grid Voltage
Suppressor Grid Voltage
Peak A-F Grid Voltage .
Zero Signal Plate Current .
NIaximum Signal Plate Current .
Zero Signal Screen Grid Current
Maximum Signal Screen Grid Current .
Transconductance
Plate Resistance .
Load Resistance . . . .
Maximum Signal Power Output
Total Harmonic Distortion .
3.0 3.0 volts
135 150 volts
135 150 volts
-16 -18 volts
0 0 volts
12 12 volts
22 24 milliamperes
24.5 26 milliamperes
1.1 1.2 milliamperes
5.5 4.8 milliamperes
3250 3400 micromhos
60000 60000 ohms
4500 4-000 ohms
1.8 2.0 Watts
125 12.0 per cent
l. Pin # 6 is approximately 3/32 inch shorter than the other
pins to minimize noise when changing tubes while in service.