Western electric 272 a brochure
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Page 1
BELL SYSTEM PRACTICES SECTION AB46.272A
IRANSMISSION ENGINEERING AND DATA ISSUE I, OCTOBER I950
ELECTRON TUBE DAYA ALETi CO. STANDARD
TRIODE .
LOW POWER AMPLIFIER /9513! 51861716
DESCRIPTION
The 272A is a triode having an indirectly heated cathode. It is designed for use as a
radio-frequency antenna-coupling amplifier, low-power audio-frequency amplifier,
detector or modulator.
CHARACTERISTICS
Heater Voltage 10.0 volts
Maximum Plate Voltage 180 volts
Amplification Factor . 6.0
ELECTRON TUBE DATA SHEET
FILE: GENERAL PURPOSE SECTION
3' 272A
TRIODE
Page 2
272A - PAGE 2
GENERAL CHARACTERISTICS
ELECTRICAL DATA
Heater Voltage, A-C or D-C 10.0 volts
Heater Current , 320 milliamperes
Direct Interelectrode Capacitances (without external shield)
Grid to Plate 2.8 uuf
Input , , . , , . . , . . . . . . . , 3.1 uuf
Output , . , . . , . . , . . . 2.5 uuf
MECHANICAL DATA
Cathode . . . , . . . Coated unipotential
Bulb . . , . . . ST14
Base , , . , , . . . Medium 5-pin, with bayonet pin
Mounting Position . Any
Dimensions and pin connections shown in outline drawing on Page 5
MAXIMUM RATINGS, Design-Cenier Values
Plate Voltage . . . . . 180 volts
Plate D'Bsipation , 2.0 watts
Plate Current . 12.0 milliamperes
Heater-Cathode Voltage I 100 volts
TYPICAL OPERATING CONDITIONS AND CHARACTERISTICS - CLASS A1 AMPLIFIER
Plate Voltage , 100 120 160 180 volts
Grid Voltage -7 -10 -17 -21 volts
Peak A-F Grid Voltage 7 10 17 21 volts
Plate Current . . . 6.6 6.7 6.6 6.2 milliamperes
Transconductance 950 910 820 760 micromhos
Amplification Factor 6.0 5.8 5.6 5.5
Plate Resistance 6300 6400 6800 7200 ohms
Load Resistance 12600 12800 13600 14400 ohms
Maximum Signal Power Output 50 60 150 210 milliwatts
Total Harmonic Distortion 4.0 5.0 6.3 8.0 per cent