Western electric 271 a brochure
This is the 6 pages manual for western electric 271 a brochure.
Read or download the pdf for free. If you want to contribute, please upload pdfs to audioservicemanuals.wetransfer.com.
Extracted text from western electric 271 a brochure (Ocr-read)
Page 1
BELL SYSTEM PRACTICES SECTION AB46.27IA
TRANSMISSION ENGINEERING AND DATA ISSUE I, AUGUST I948
ELECTRON TUBE DATA A.T.&T. CO. STANDARD
moms .
POWER AMPLIFIER Western Electric
DESCRIPTION
The 271A is a power amplifier triode having an indirectly heated cathode. It is
. designed for use in amplifier, modulator, or oscillator circuits for both audio and
radio frequencies.
CHARACTERISTICS
Heater Voltage , r . . I . r . . . 5.0 volts
Maximum Plate Voltage V . i . 450 volts
. Power Output , . . i . 3.0 watts
ELECTRON TUBE DATA SHEET
FILE: GENERAL PURPOSE SECTION
12-47
Page 2
271A -- PAGE 2
GENERAL CHARACTERISTICS
ELECTRICAL DATA
Heater Voltage, A-C or D-C 5.0 volts
Heater Current , 2.0 amperes
Direct Interelectrode Capacitances (without external shield)
Grid to Plate , 4.2 uuf
Input . 6.7 uuf
Output . . . 3.1 uuf
MECHANICAL DATA
Cathode , Coated Unipotential
Bulb _ 819
Base , Medium 5-pin
Mounting Position Any
Dimensions and pin connections shown in outline drawing on Page 5
MAXIMUM RATINGS, Design-Center Values
Plate Voltage . 450 volts
Plate Dissipation 27 Watts
Plate Current 7 60 milliamperes
Heater-Cathode Voltage , 100 volts
TYPICAL OPERATING CONDITIONS AND CHARACTERISTICS - CLASS A1 AMPLIFIER
Plate Voltage , 300 350 400 450 volts
Grid Voltage -25 -25 30 -30 volts
Peak A-F Grid Voltage 25 25 30 30 volts
Plate Current 19.5 34.5 37.5 57.5 milliamperes
Transconductance 2250 2930 2920 3480 micromhos
Amplification Factor 8.2 8.4 8.3 8.5
Plate Resistance 3650 2850 2830 2450 ohms
Load Resistance , 14600 5700 6000 4900 ohms
Maximum Signal Power Output 0.9 1.7 2.4 3.1 watts
Total Harmonic Distortion 4.5 6 6 3.1 per cent