Western electric 375 a brochure
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Page 1
BELL SYSTEM PRACTICES SECTION AB46.375A
Transmission Engineering Data Issue 1, May 1950
Vacuum Tube Data A.T.&T. Co. Standard
PENTODE W512! Electric
DESCRIPTION
The 375A is a beam power pentode of the heater cathode type. It is designed for use as an
audio-frequency amplifier at plate voltages up to 130 volts. It is particularly suitable for
use in communication installations where the available plate supply is only 48 volts.
CHARACTERISTICS
Heater Voltage . , . . El, : E0 = 45 volts; . , . . 20 volts
Transconductance . . _ . . . . 4800 micromhos
Power Output . . . . , E : 4 VOIts . . . . 025 watt
ELECTRON TUBE DATA SHEET
FILE: GENERAL PURPOSE SECTION
11.49 3 7 5 A
PENTODE
Page 2
375A - PAGE 2
GENERAL CHARACTERISTICS
ELECTRICAL DATA
Heater Voltage, A-C or D-C
Heater Current . . . . . . . . . . .
Direct Interelectrode Capacitanees (without external shield)
Grid to Plate
Input .
Output
MECHANICAL DATA
Cathode
Bulb
Base . .
Mounting Position
20.0 volts
320 tnilliamperes
1.0 uuf
13.5 uuf
8.5 uuf
Coated Unipotential
T11
Medium shell, 6-pin octaI
Any
Dimensions and pin connections shown in outline drawing on Page 6
MAXIMUM RATINGS, Design-Center Values
Plate Voltage . .
Screen Grid Voltage .
Maximum Signal Plate Current .
Plate Dissipation .
Screen Grid Dissipation .
130 volts
130 volts
50 milliamperes
6 watts
13 watts
Maximum Grid Circuit Resistance for
Fixed Bias .
Cathode Bias .
TYPICAL OPERATING CONDITIONS AND CHARACTERISTICS
Plate Voltage . . . . . . . . . . . . 45
Screen Grid Voltage . . . . . . . . . . 45
Control Grid Voltage . . . . . . . . . . --4
Peak A-F Grid Voltage . . . . . . . . . 4
Zero Signal Plate Current . . . . . . . 12.5
Maximum Signal Plate Current . . , . . . . 13.8
Zero Signal Screen Grid Current . . . . . . 1.5
hiaximum Signal Screen Grid Current . . . . . 4.0
Transconductanee . . . . . . . . . . . 4800
Plate Resistance . . . . . . . . . . . 9300
Load Resistance . . . . . . . . . . . 2800
Maximum Signal Power Output . . . . . . . 0.25
Total Harmonic Distortion . . . . . . . . 10
90
90
-75
7.5
33
34
3.7
11.7
6600
7800
2500
1.4
8
0.1 megohrn
0.5 megohm
120 volts
120 volts
-12 volts
12 volts
34 milliamperes
37 milliamperes
3.7 milliarnperes
19.0 milliarnperes
6200 micromhos
8000 ohms
2500 ohms
2.5 watts
14 per cent