Western electric 293 a brochure
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Page 1
BELL SYSTEM PRACTICES SECTION AB46.293A
Transmission Engineering Data Issue 1, September 1950
Vacuum Tube Data AtT.&T. Co. Standard
PENTODE
POWER AMPLIFIER @579! Electric
DESCRIPTION
The 293A is a suppressor grid, power pentode having an indirectly heated cathode. It is
designed for use as an audio-frequency power amplifier in Class A1 service.
CHARACTERISTICS
Heater Voltage 1 l , . . . . . . I . . . . . 10.0 volts
Plate Current . . . Eb : E02 2 180 volts; . . . . 15.8 milllamperes
Transconductance . E _ _ 18 olt . E _ 0 . 1175 micromhos
Power Output . l _ V s 3 _ 1.2 watts
ELECTRON TUBE DATA SHEET
FILE: GENERAL PURPOSE SECTION
293A
PENTODE
Page 2
293A -- PAGE 2
GENERAL CHARACTERISTICS
ELECTRICAL DATA
Heater Voltage, A-C or D-C
Heater Current
Direct Intereleetrode Capacitances (without external shield)
Grid to Plate .
Input
Output.
MECHANICAL DATA
Cathode .
Bulb.
Base . . .
Mounting Position .
Dimensions and pin connections shown in outline drawing on Page 6
MAXIMUM RATINGS, Design-Center Values
Plate Voltage . .
Screen Grid Voltage .
Plate Dissipation . ,
Screen Grid Dissipation .
Cathode Current . .
Heater-Cathode Voltage .
TYPICAL OPERATING CONDITIONS AND CHARACTERISTICS
SINGLE TUBE AMPLIFIER -CLASS A.
Plate Voltage , . .
Screen Grid Voltage .
Control Grid Voltage .
Peak A-F Grid Voltage .
Zero Signal Plate Current .
NIaximum Signal Plate Current .
Zero Signal Screen Grid Current .
NIaximum Signal Screen Grid Current .
Transconductance
Plate Resistance .
Load Resistance .
Nlaximum Signal Power Output
Total Harmonic Distortion .
135
135
- 12
12
12.5
13.5
1.9
3.2
1140
95000
11000
0.6
9.7
180
180
- 18
18
15.8
17.0
2.7
52
1175
100000
11500
1.3
11
10.0
320
0.66
6.2
6.5
Coated Unipotential
ST14
volts
milliamperes
uuf
uuf
uuf
Medium 6-pin
Any
250
200
150
- 18
18
21.5
23.5
3.5
5.6
1340
100000
12000
2.1
10
volts
volts
watts
watt
milliamperes
volts
volts
volts
volts
volts
milliamperes
milliamperes
milliamperes
milliamperes
micromhos
ohms
ohms
watts
per cent