Power - Triode (over 1000V 100W) ·Triode
Forced-air-cooled high-power transmitting triode for RF amplification, oscillation, and Class B modulation. Rated around 20 kW plate dissipation and 20 kV plate voltage for substantial fixed-station transmitter service.
Forced-air-cooled high-power transmitting triode for RF amplifier, oscillator, or Class-B modulator service, rated through approximately 5 MHz.
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
Promoted ratings/characteristics mapped from printed headings; device/service-specific values retained in parameters.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Amplification Factor
34.5
Maximum Plate Voltage
20000 V
Maximum Plate Dissipation
20000 W
Maximum Cathode Current
7 A
Maximum Frequency at Full Rating
5 MHz
Data set 02
Published operating points and test conditions from this source.
The ML [1]
893 kV
The ML-893A-R is a three-clectrode tube designed specifically ratings of 20 kVdc plate voltage and 70 kW plate input apply
The ML [2]
20 kV
The ML-893A-R is a three-clectrode tube designed specifically ratings of 20 kVdc plate voltage and 70 kW plate input apply
The ML [3]
70 kV
The ML-893A-R is a three-clectrode tube designed specifically ratings of 20 kVdc plate voltage and 70 kW plate input apply
Filament Voltage (Notes [1]
1
Filament Voltage (Notes 1 and 2) oo 20 Valts
Filament Voltage (Notes [2]
2
Filament Voltage (Notes 1 and 2) oo 20 Valts
Filament Voltage (Notes [3]
20
Filament Voltage (Notes 1 and 2) oo 20 Valts
Filament Current at [1]
20 V
Filament Current at 20 Volts (Notes 1 and 2) 175 183 190 Ampa
Filament Current at [2]
1 V
Filament Current at 20 Volts (Notes 1 and 2) 175 183 190 Ampa
Filament Current at [3]
2 V
Filament Current at 20 Volts (Notes 1 and 2) 175 183 190 Ampa
Filament Current at [4]
175 V
Filament Current at 20 Volts (Notes 1 and 2) 175 183 190 Ampa
Filament Current at [5]
183 V
Filament Current at 20 Volts (Notes 1 and 2) 175 183 190 Ampa
Filament Current at [6]
190 V
Filament Current at 20 Volts (Notes 1 and 2) 175 183 190 Ampa
Filament Starting Current (Note [1]
1 A
Filament Starting Current (Note 1) e - — 275 Amps
Filament Starting Current (Note [2]
275 A
Filament Starting Current (Note 1) e - — 275 Amps
Plate Dissipation — Per Cont of Rating oo, [1]
100
Plate Dissipation — Per Cont of Rating oo, 100 R0 65
Plate Dissipation — Per Cont of Rating oo, [2]
65
Plate Dissipation — Per Cont of Rating oo, 100 R0 65
Air Flow — Cubic Feet per Minute .ot [1]
1800
Air Flow — Cubic Feet per Minute .ot 1800 1250 1000
Air Flow — Cubic Feet per Minute .ot [2]
1250
Air Flow — Cubic Feet per Minute .ot 1800 1250 1000
Air Flow — Cubic Feet per Minute .ot [3]
1000
Air Flow — Cubic Feet per Minute .ot 1800 1250 1000
Maximum Anode Temperature
230 mA
Maximum Anode Temperature 230 °C
Maximum Glass Temperature
150 mA
Maximum Glass Temperature 150 °C
Note
30
Note 30 Air flow to be directed into stem through tubing in center of base.
D-C Plate Voltage
20000 V
D-C Plate Voltage 20000 volts
Max. Signal D-C Plate Current§
4 A
Max. Signal D-C Plate Current§ . 4.0 amps
Max. Signal Plate Input§ [1]
60000 V
Max. Signal Plate Input§ 60000 watts D-C Plate Voltage ........... bttt ne s anenens 12000 volts
Max. Signal Plate Input§ [2]
12000 V
Max. Signal Plate Input§ 60000 watts D-C Plate Voltage ........... bttt ne s anenens 12000 volts
Plate Dissipation§ ...c.ocovevieeenniieccenmnnesrcsneesiaerneennnes [1]
20000 A
Plate Dissipation§ ...c.ocovevieeenniieccenmnnesrcsneesiaerneennnes 20000 watts D-C Plate CUIrent .....cccoeeeerieniinencenienresneceecsnesenn 2 amps
Plate Dissipation§ ...c.ocovevieeenniieccenmnnesrcsneesiaerneennnes [2]
2 A
Plate Dissipation§ ...c.ocovevieeenniieccenmnnesrcsneesiaerneennnes 20000 watts D-C Plate CUIrent .....cccoeeeerieniinencenienresneceecsnesenn 2 amps
D.C Grid Voltage
-3000 V
D.C Grid Voltage -3000 volts
D-C Grid Current
400 mA
D-C Grid Current 0.4 amps
Typical Operation® Plate Input
24000 W
Typical Operation® Plate Input 24000 watts
D.C Plate Voltage [1]
12000 V
D.C Plate Voltage ... . 12000 15000 18000 volts Plate Dissipation .. 12000 walts
D.C Plate Voltage [2]
15000 V
D.C Plate Voltage ... . 12000 15000 18000 volts Plate Dissipation .. 12000 walts
D.C Plate Voltage [3]
18000 V
D.C Plate Voltage ... . 12000 15000 18000 volts Plate Dissipation .. 12000 walts
D.C Plate Voltage [4]
12000 V
D.C Plate Voltage ... . 12000 15000 18000 volts Plate Dissipation .. 12000 walts
Zero Signal D-C Plate Current [1]
800 mA
Zero Signal D-C Plate Current ... 0.8 0.8 0.8 amps
Zero Signal D-C Plate Current [2]
800 mA
Zero Signal D-C Plate Current ... 0.8 0.8 0.8 amps
Zero Signal D-C Plate Current [3]
800 mA
Zero Signal D-C Plate Current ... 0.8 0.8 0.8 amps
Max. Signal D-C Plate Current [1]
7 A
Max. Signal D-C Plate Current ... 7 6 5.5 amps Typical Operation
Max. Signal D-C Plate Current [2]
6 A
Max. Signal D-C Plate Current ... 7 6 5.5 amps Typical Operation
Max. Signal D-C Plate Current [3]
5.5 A
Max. Signal D-C Plate Current ... 7 6 5.5 amps Typical Operation
D-C Grid Voltage ooovvoevoeeeeineen ~ [1]
260 V
D-C Grid Voltage ooovvoevoeeeeineen ~260 =350 —450 volts D-C Plate Voltage 10000 10000 12000 volts
D-C Grid Voltage ooovvoevoeeeeineen ~ [2]
350 V
D-C Grid Voltage ooovvoevoeeeeineen ~260 =350 —450 volts D-C Plate Voltage 10000 10000 12000 volts
D-C Grid Voltage ooovvoevoeeeeineen ~ [3]
-450 V
D-C Grid Voltage ooovvoevoeeeeineen ~260 =350 —450 volts D-C Plate Voltage 10000 10000 12000 volts
D-C Grid Voltage ooovvoevoeeeeineen ~ [4]
10000 V
D-C Grid Voltage ooovvoevoeeeeineen ~260 =350 —450 volts D-C Plate Voltage 10000 10000 12000 volts
D-C Grid Voltage ooovvoevoeeeeineen ~ [5]
10000 V
D-C Grid Voltage ooovvoevoeeeeineen ~260 =350 —450 volts D-C Plate Voltage 10000 10000 12000 volts
D-C Grid Voltage ooovvoevoeeeeineen ~ [6]
12000 V
D-C Grid Voltage ooovvoevoeeeeineen ~260 =350 —450 volts D-C Plate Voltage 10000 10000 12000 volts
Peak A-F Grid-to-Grid Voltage [1]
1480 V
Peak A-F Grid-to-Grid Voltage ... 1480 1560 1720 volts D-C Plate Current ... 1.5 2 2 amps
Peak A-F Grid-to-Grid Voltage [2]
1560 V
Peak A-F Grid-to-Grid Voltage ... 1480 1560 1720 volts D-C Plate Current ... 1.5 2 2 amps
Peak A-F Grid-to-Grid Voltage [3]
1720 V
Peak A-F Grid-to-Grid Voltage ... 1480 1560 1720 volts D-C Plate Current ... 1.5 2 2 amps
Peak A-F Grid-to-Grid Voltage [4]
1.5 V
Peak A-F Grid-to-Grid Voltage ... 1480 1560 1720 volts D-C Plate Current ... 1.5 2 2 amps
Peak A-F Grid-to-Grid Voltage [5]
2 V
Peak A-F Grid-to-Grid Voltage ... 1480 1560 1720 volts D-C Plate Current ... 1.5 2 2 amps
Peak A-F Grid-to-Grid Voltage [6]
2 V
Peak A-F Grid-to-Grid Voltage ... 1480 1560 1720 volts D-C Plate Current ... 1.5 2 2 amps
Effective Load Resistance (plate D-C Grid Voltage ~ [1]
800 V
Effective Load Resistance (plate D-C Grid Voltage ~800 —800 -1000 volts
Effective Load Resistance (plate D-C Grid Voltage ~ [2]
-800 V
Effective Load Resistance (plate D-C Grid Voltage ~800 —800 -1000 volts
Effective Load Resistance (plate D-C Grid Voltage ~ [3]
-1000 V
Effective Load Resistance (plate D-C Grid Voltage ~800 —800 -1000 volts
to plate) v [1]
4000 V
to plate) v 4000 6000 8000 ohms Peak R-F Grid Voltage .... 1200 1280 1500 volts
to plate) v [2]
6000 V
to plate) v 4000 6000 8000 ohms Peak R-F Grid Voltage .... 1200 1280 1500 volts
to plate) v [3]
8000 V
to plate) v 4000 6000 8000 ohms Peak R-F Grid Voltage .... 1200 1280 1500 volts
to plate) v [4]
1200 V
to plate) v 4000 6000 8000 ohms Peak R-F Grid Voltage .... 1200 1280 1500 volts
to plate) v [5]
1280 V
to plate) v 4000 6000 8000 ohms Peak R-F Grid Voltage .... 1200 1280 1500 volts
to plate) v [6]
1500 V
to plate) v 4000 6000 8000 ohms Peak R-F Grid Voltage .... 1200 1280 1500 volts
Max. Signal Driving Power [1]
220 A
Max. Signal Driving Power ............ 220 190 140 watts D-C Grid Current, approximate ...... 0.10 0.16 0.14 amps
Max. Signal Driving Power [2]
190 A
Max. Signal Driving Power ............ 220 190 140 watts D-C Grid Current, approximate ...... 0.10 0.16 0.14 amps
Max. Signal Driving Power [3]
140 A
Max. Signal Driving Power ............ 220 190 140 watts D-C Grid Current, approximate ...... 0.10 0.16 0.14 amps
Max. Signal Driving Power [4]
100 mA
Max. Signal Driving Power ............ 220 190 140 watts D-C Grid Current, approximate ...... 0.10 0.16 0.14 amps
Max. Signal Driving Power [5]
160 mA
Max. Signal Driving Power ............ 220 190 140 watts D-C Grid Current, approximate ...... 0.10 0.16 0.14 amps
Max. Signal Driving Power [6]
140 mA
Max. Signal Driving Power ............ 220 190 140 watts D-C Grid Current, approximate ...... 0.10 0.16 0.14 amps
Max. Signal Power Output. Driving Power, approximate [1]
120 mA
Max. Signal Power Output. Driving Power, approximate .......... 120 210 210 watts
Max. Signal Power Output. Driving Power, approximate [2]
210 mA
Max. Signal Power Output. Driving Power, approximate .......... 120 210 210 watts
Max. Signal Power Output. Driving Power, approximate [3]
210 mA
Max. Signal Power Output. Driving Power, approximate .......... 120 210 210 watts
Power Output, approximate [1]
11000 mA
Power Output, approximate ............ 11000 15000 18000 watts
Power Output, approximate [2]
15000 mA
Power Output, approximate ............ 11000 15000 18000 watts
Power Output, approximate [3]
18000 mA
Power Output, approximate ............ 11000 15000 18000 watts
D-C Plate Voltage oo
20000 V
D-C Plate Voltage oo 20000 volts
D-C Grid Voltage ..o ~
3000 V
D-C Grid Voltage ..o ~3000 volts
D-C Grid Current
4 A
D-C Grid Current ... 04 amps
Plate Input
70000 W
Plate Input ... 70000 watts
Plate DIsSipation ..o
20000 W
Plate DIsSipation ..o 20000 watts
Plate Dissipation
20000 W
Plate Dissipation ... 20000 watts
D-C Plate Voltage ..o [1]
12000 V
D-C Plate Voltage ..o 12000 15000 15000 volts D-C Plate Voltage .coovvenicvccinncnnne 12000 15000 18000 volts
D-C Plate Voltage ..o [2]
15000 V
D-C Plate Voltage ..o 12000 15000 15000 volts D-C Plate Voltage .coovvenicvccinncnnne 12000 15000 18000 volts
D-C Plate Voltage ..o [3]
15000 V
D-C Plate Voltage ..o 12000 15000 15000 volts D-C Plate Voltage .coovvenicvccinncnnne 12000 15000 18000 volts
D-C Plate Voltage ..o [4]
12000 V
D-C Plate Voltage ..o 12000 15000 15000 volts D-C Plate Voltage .coovvenicvccinncnnne 12000 15000 18000 volts
D-C Plate Voltage ..o [5]
15000 V
D-C Plate Voltage ..o 12000 15000 15000 volts D-C Plate Voltage .coovvenicvccinncnnne 12000 15000 18000 volts
D-C Plate Voltage ..o [6]
18000 V
D-C Plate Voltage ..o 12000 15000 15000 volts D-C Plate Voltage .coovvenicvccinncnnne 12000 15000 18000 volts
D-C Plate Current [1]
1.5 A
D-C Plate Current . . 1.5 1.5 2.0 amps D-C Plate Current ... 35 3.6 3.6 amps
D-C Plate Current [2]
1.5 A
D-C Plate Current . . 1.5 1.5 2.0 amps D-C Plate Current ... 35 3.6 3.6 amps
D-C Plate Current [3]
2 A
D-C Plate Current . . 1.5 1.5 2.0 amps D-C Plate Current ... 35 3.6 3.6 amps
D-C Plate Current [4]
35 A
D-C Plate Current . . 1.5 1.5 2.0 amps D-C Plate Current ... 35 3.6 3.6 amps
D-C Plate Current [5]
3.6 A
D-C Plate Current . . 1.5 1.5 2.0 amps D-C Plate Current ... 35 3.6 3.6 amps
D-C Plate Current [6]
3.6 A
D-C Plate Current . . 1.5 1.5 2.0 amps D-C Plate Current ... 35 3.6 3.6 amps
D-C Grid Voltage ..o, ~ [1]
250 V
D-C Grid Voltage ..o, ~250 =340 ~340 volts D-C Grid Voltage ...... wee =800 =900 —1000 volts
D-C Grid Voltage ..o, ~ [2]
340 V
D-C Grid Voltage ..o, ~250 =340 ~340 volts D-C Grid Voltage ...... wee =800 =900 —1000 volts
D-C Grid Voltage ..o, ~ [3]
340 V
D-C Grid Voltage ..o, ~250 =340 ~340 volts D-C Grid Voltage ...... wee =800 =900 —1000 volts