Western electric 300 b brochure
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Page 1
BELL SYSTEM PRACTICES SECTION ABAesooa
Transmission Engineering Data Issue 1, January 1950
Vacuum Tube Data A.T.&T. Co. Standard
TRIODE
POWER AMPLIFIER 931?! Electric
DESCRIPTION
The 3003 is a filamentary type triode designed for use as an audio-frequency power
amplifier.
CHARACTERISTlCS
Filament Voltage . . . . . . . . 5.0 volts
Plate Current . . . . Eb = 350 volts; 60 milliamperes
Power Output _. . . . E1: = _74 volts . . . . . 8 watts
ELECTRON TUBE DATA SHEET
FILE: GENERAL PURPOSE SECTION
5-49 300 B
TRIODE
Page 2
3003 - PAGE 2
GENERAL CHARACTERISTICS
ELECTRICAL DATA
Filament Voltage, A-C or D-C 5.0 volts
Filament Current . 1.2 amperes
Direct Interelectrode Capacitances .
Grid to Plate 15 uuf .
Input 8.5 uuf
Output 4.1 uuf
MECHANICAL DATA
Cathode . . . . . . . Coated Filament
Base . . . . . . . . - Medium 4-pin with skew bayonet pin
Mountmg P0515011 - - - - - - - Preferably vertical; if horizontal, pins #1
and #2 must be in same vertical plane .
Dimensions and pin connections shown in outline drawing on Page 6 I
MAXIMUM RATINGS, Design-Center Values
Plate Voltage . . . . . 400 volts
Plate Current. 100 milliamperes
Plate Dissipation . 36 watts
Maximum Grid Circuit Resistance for
Fixed Bias . . . . . . . . . 0.05 megohm
Self Bias . 0.25 megohm
TYPICAL OPERATING CONDITIONS AND CHARACTERISTICS I
SINGLE TUBE AMPLIFIER-CLASS Al . 1
Filament Voltage, A-C 5.0 5.0 volts '
Plate Voltage . 300 350 volts
Grid Voltage . . -61 -74 volts
Peak A-F Signal Voltage. 61 74 volts
Zero Signal Plate Current 62 60 milliamperes
Maximum Signal Plate Current . 74 77 milliamperes
Transconductance 5300 5000 micromhos
Plate Resistance 740 790 ohms
Load Resistance 3000 4000 ohms
Amplification Factor . 3.9 3.9
Maximum Signal Power Output. 6 7 watts
Total Harmonic Distortion 5 5 per cent .
PUSH-PULL AMPLIFIER-CLASS Al '
Unless otherwise specified, values are for 2 tubes
Filament Voltage, A-C 5.0 5.0 volts
Plate Voltage . . 300 350 volts
Grid Voltage . . -61 -67.5 volts
Peak A-F Grid-to-Grid Voltage . 122 135 volts
Zero Signal Plate Current 100 170 milliamperes
Nlaximum Signal Plate Current . 150 200 milliamperes .
Effective Load Resistance (Plate-to-Plate) . 4000 4000 ohms
Maximum Signal Power Output. 10 20 watts
Total Harmonic Distortion 4.5 2 per cent
If the filament is operated on D.C., the characteristics will be approximately the same
if the grid voltage, measured from the negative filament, is decreased by 2.5 volts.