Western electric 284 d brochure

Page 1

BELL SYSTEM PRACTICES
TRANSMISSION ENGINEERING AND DATA
ELECTRON TUBE DATA

TRIODE

SECTION 5461840
ISSUE 1, FEBRUARY 1949
A.T.&T. C0. STANDARD

AMPLIFIER, OSCILLATOR OR MODULATOR wafer EIeCfrIc

DESCRIPTION

The 284D is a three-electrode tube
. designed for use as an audio-frequency
amplifier and modulator. It may also be
used as a radio-frequency amplifier or
oscillator. The anode is capable of dis-

MAXIMUM RATINGS

. D-C Plate Voltage

D-C Plate Current
Continuous Plate Dissipation
D-C Grid Current

ELECTRON TUBE DATA SHEET
FIgJE: TRANSMITTING SECTION
5- 8

sipating 100 watts and cooling is accom-
plished by radiation. The cathode is a
thoriated tungsten filament. Maximum
ratings apply up to 6 megacycles.

1250 volts
150 milliamperes
100 watts
100 milliamperes

Page 2

284D - PAGE 2

GENERAL CHARACTERISTICS

ELECTRICAL DATA

Filament Voltage , .
Filament Current at Bogey Voltage
Amplification Factor

Conditions: E. : 1250 volts, L, = 64 milliamperes

Interelecttode Capacitances
Grid-Plate
Grid-Filament
Plate-Filament

MECHANICAL DATA

Mounting Position

Net Weight, Approximate

Min. Bogey Max.
9.5 10.0 10.5 volts
3.1 3.25 3.4 amperes

4.3 4.8 5.3

7.6 8.6 9.6 uuf
4.5 5.4 6.3 uuf
4.1 5.5 6.9 uuf

Vertical or horizontal with
plane of filament vertical
6.5 ounces

MAXIMUM RATINGS AND TYPICAL OPERATING CONDITIONS

AUDIO-FREQUENCY POWER AMPLIFIER AND MODULATOR-CLASS A1

MAXIMUM RATINGS, Absolute Values

D-C Plate Voltage
D-C Grid Voltage
Plate Input

Plate Dissipation

TYPICAL OPERATION

D-C Plate Voltage

D-C Grid Voltage

Peak A-F Grid Voltage
D-C Plate Current

Load Resistance . .
Total Harmonic Distortion
Power Output

CCS
750
-100
100
110
8000
2.4
11.0

CCS

1250 volts

-240 volts
85 watts
85 watts

CCS CCS
1000 12 50 volts
-160 -215 volts
160 2 1 5 volts
83 68 milliamperes
8 5 00 1 2000 ohms
3.6 4.4 per cent
24.4 31.0 watts