Western electric 242 c brochure
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Page 1
BELL SYSTEM PRACTICES
TRANSMISSION ENGINEERING AND DATA
ELECTRON TUBE DATA
TRIODE
SECTION AB46.242C
ISSUE I, NOVEMBER I948
A.T.&T. CO. STANDARD
Western Electric
AMPLIFIER, OSCILLATOR OR MODULATOR
DESCRIPTION
. The 242C is a three-electrode tube
designed for use as a radio-frequency
amplifier or oscillator, audio-frequency
amplifier or modulator. The anode is
capable of dissipating 100 watts and
MAXIMUM RATINGS
. D-C Plate Voltage
D-C Plate Current
Continuous Plate Dissipation
D-C Grid Current
ELECTRON TUBE DATA SHEET
£141.13: TRANSMITTING SECTION
- 8
the cooling is accomplished by radiation.
The tube is capable of operating up to
6 megacycles at maximum ratings and up
to 30 megacycles at reduced ratings. The
cathode is a thoriated tungsten filament.
1250 volts
150 milliamperes
100 watts
50 milliamperes
Page 2
242C - PAGE 2
GENERAL CHARACTERISTICS
ELECTRICAL DATA
1. Represents maximum usable cathode current for tube as plate
current plus grid current for any condition of operation.
Min. Bogey Max.
Filament Voltage 9.5 10.0 10.5 volts
Filament Current at Bogey Voltage 3.1 3.25 3.4 amperes
Amplification Factor
Conditions: E, = 1250 volts, 1,, = 68 milliamperes 11 12.5 14
Interelecttode Capacitances
Grid-Plate 11.4 13.0 14.6 uuf
Grid-Filament 4.8 6.1 7.1 uuf
Plate-Filament 3.2 4.7 5.9 uuf
Maximum Usable Cathode Current1 1.3 amperes
MECHANICAL DATA
Mounting Position . , . . Vertical, or horizontal with plane of filament vertical
Type of Cooling Radiation
Net Weight, Approximate 8 ounces
MAXIMUM RATINGS AND TYPICAL OPERATING CONDITIONS
AUDIO-FREQUENCY POWER AMPLIFIER AND MODULATOR-CLASS A1
MAXIMUM RATINGS, Absolute Values
CCS
D-C Plate Voltage 1250 volts
D-C Grid Voltage -80 volts
Plate Input 85 watts
Plate Dissipation 85 watts
TYPICAL OPERATION
CCS CCS
D-C Plate Voltage 1000 1250 volts
D-C Grid Voltage 747 -70 volts
Peak A-F Grid Voltage 47 70 volts
D-C Plate Current 85 68 milliamperes
Load Resistance 7000 9000 ohms
Total Harmonic Distortion 5 5 per cent
Power Output 12.5 22 watts