Power - Triode (over 1000V 100W) ·Triode
Water-cooled high-power transmitting triode with pure-tungsten filament for RF amplifier, oscillator, and Class B modulator service. Rated around 20 kW plate dissipation and 20 kV plate voltage for major fixed transmitter installations.
Water-cooled high-power transmitting triode for RF amplifier, oscillator, or Class-B modulator service, with pure-tungsten filament.
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 Signal Power Output
70 kW
AudioFrequency,ClassB
Data set 02
Published operating points and test conditions from this source.
The ML [1]
893 kV
The ML-893A is a three-clectrode tube designed specifically of 20 kVdc plate voltage and 70 kW plate input apply at fre-
The ML [2]
20 kV
The ML-893A is a three-clectrode tube designed specifically of 20 kVdc plate voltage and 70 kW plate input apply at fre-
The ML [3]
70 kV
The ML-893A is a three-clectrode tube designed specifically of 20 kVdc plate voltage and 70 kW plate input apply at fre-
Filament Voltage (Notes [1]
1 V
Filament Voltage (Notes 1T and 2) i — 20 — Volts
Filament Voltage (Notes [2]
2 V
Filament Voltage (Notes 1T and 2) i — 20 — Volts
Filament Voltage (Notes [3]
20 V
Filament Voltage (Notes 1T and 2) i — 20 — Volts
Filament Current at Bogey Voltage (Notes [1]
1 A
Filament Current at Bogey Voltage (Notes 1T and 2) oo, 175 183 190 Amps
Filament Current at Bogey Voltage (Notes [2]
2 A
Filament Current at Bogey Voltage (Notes 1T and 2) oo, 175 183 190 Amps
Filament Current at Bogey Voltage (Notes [3]
175 A
Filament Current at Bogey Voltage (Notes 1T and 2) oo, 175 183 190 Amps
Filament Current at Bogey Voltage (Notes [4]
183 A
Filament Current at Bogey Voltage (Notes 1T and 2) oo, 175 183 190 Amps
Filament Current at Bogey Voltage (Notes [5]
190 A
Filament Current at Bogey Voltage (Notes 1T and 2) oo, 175 183 190 Amps
Filament Starting Current (NOte [1]
1 A
Filament Starting Current (NOte 1) ie — — 275 Amps
Filament Starting Current (NOte [2]
275 A
Filament Starting Current (NOte 1) ie — — 275 Amps
Maximum Outgoing Water Temperature .......c.coccviciieiniiiieniniinrcnnncieennns
70 mA
Maximum Outgoing Water Temperature .......c.coccviciieiniiiieniniinrcnnncieennns 70 °C
Air Flow to Stem (INOtE [1]
3
Air Flow to Stem (INOtE 3) oot 2 «m
Air Flow to Stem (INOtE [2]
2
Air Flow to Stem (INOtE 3) oot 2 «m
Maximum Glass Temperature .......coooviceiieiniriinnnie e
150 mA
Maximum Glass Temperature .......coooviceiieiniriinnnie e 150 °C
Note
3
Note 3: Air flow to be directed into stem through tubing in center of hase.
Max. Signal D-C Plate CurrentH oo
4 A
Max. Signal D-C Plate CurrentH oo 4.0 amps Maximum Ratings, Absolute Vulues
D-C Plate Voltage
12000 V
D-C Plate Voltage 12000 volts
Muax. Signal Plate Input
60000 W
Muax. Signal Plate Input ... 60000 watts
D-C Pla.te Current
2 A
D-C Pla.te Current . 2 amps
Plate Dissipationf ..o
20000 W
Plate Dissipationf ..o 20000 watts
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
Plate Input .o
24000 W
. . Plate Input .o 24000 watts
Typical Operation® Plate Dissipation .......cccoovviiviinnciininnn
12000 W
Typical Operation® Plate Dissipation .......cccoovviiviinnciininnn. 12000 watts
D-C Plate Voltage o, [1]
12000 V
D-C Plate Voltage o, 12000 15000 18000 volts
D-C Plate Voltage o, [2]
15000 V
D-C Plate Voltage o, 12000 15000 18000 volts
D-C Plate Voltage o, [3]
18000 V
D-C Plate Voltage o, 12000 15000 18000 volts
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 Voluge [1]
260 V
D-C Grid Voluge 260 =330 ~450 volts D-C Plate Voltage ...ccoovviiniinns 10000 10000 12000 volts
D-C Grid Voluge [2]
330 V
D-C Grid Voluge 260 =330 ~450 volts D-C Plate Voltage ...ccoovviiniinns 10000 10000 12000 volts
D-C Grid Voluge [3]
450 V
D-C Grid Voluge 260 =330 ~450 volts D-C Plate Voltage ...ccoovviiniinns 10000 10000 12000 volts
D-C Grid Voluge [4]
10000 V
D-C Grid Voluge 260 =330 ~450 volts D-C Plate Voltage ...ccoovviiniinns 10000 10000 12000 volts
D-C Grid Voluge [5]
10000 V
D-C Grid Voluge 260 =330 ~450 volts D-C Plate Voltage ...ccoovviiniinns 10000 10000 12000 volts
D-C Grid Voluge [6]
12000 V
D-C Grid Voluge 260 =330 ~450 volts D-C Plate Voltage ...ccoovviiniinns 10000 10000 12000 volts
Peak A-F Grid-to-Grid Voltage [1]
180 V
Peak A-F Grid-to-Grid Voltage ... 180 1560 1720 volts D.C Plate Current . ) s
Peak A-F Grid-to-Grid Voltage [2]
1560 V
Peak A-F Grid-to-Grid Voltage ... 180 1560 1720 volts D.C Plate Current . ) s
Peak A-F Grid-to-Grid Voltage [3]
1720 V
Peak A-F Grid-to-Grid Voltage ... 180 1560 1720 volts D.C Plate Current . ) s
Max. Signal Driving Power [1]
220 mA
Max. Signal Driving Power 220 190 140 watts cax R-L
Max. Signal Driving Power [2]
190 mA
Max. Signal Driving Power 220 190 140 watts cax R-L
Max. Signal Driving Power [3]
140 mA
Max. Signal Driving Power 220 190 140 watts cax R-L
o D-Co Grid. Current [1]
100 mA
o D-Co Grid. Current . 0.1 0.16 0.14 amps
o D-Co Grid. Current [2]
160 mA
o D-Co Grid. Current . 0.1 0.16 0.14 amps
o D-Co Grid. Current [3]
140 mA
o D-Co Grid. Current . 0.1 0.16 0.14 amps
APPIOXIILIE oo [1]
52000 W
APPIOXIILIE oo 52000 GOOOO TOO00 watts Driving Power ..o, 120 210 210 watts
APPIOXIILIE oo [2]
0 W
APPIOXIILIE oo 52000 GOOOO TOO00 watts Driving Power ..o, 120 210 210 watts
APPIOXIILIE oo [3]
120 W
APPIOXIILIE oo 52000 GOOOO TOO00 watts Driving Power ..o, 120 210 210 watts
APPIOXIILIE oo [4]
210 W
APPIOXIILIE oo 52000 GOOOO TOO00 watts Driving Power ..o, 120 210 210 watts
APPIOXIILIE oo [5]
210 W
APPIOXIILIE oo 52000 GOOOO TOO00 watts Driving Power ..o, 120 210 210 watts
Power Outpul ..oooviiiiiiciiniiininns [1]
11000 W
Power Outpul ..oooviiiiiiciiniiininns 11000 15000 18000 watts
Power Outpul ..oooviiiiiiciiniiininns [2]
15000 W
Power Outpul ..oooviiiiiiciiniiininns 11000 15000 18000 watts
Power Outpul ..oooviiiiiiciiniiininns [3]
18000 W
Power Outpul ..oooviiiiiiciiniiininns 11000 15000 18000 watts
Maximum Ratings, Absolute Values D-C Plate Voltage oo
20000 V
Maximum Ratings, Absolute Values D-C Plate Voltage oo 20000 volts
D-C Plate Current
4 A
D-C Plate Current .. 4 amps
D-C Plate Voltage
20000 V
D-C Plate Voltage 20000 volts
D-C Grid Voltage
-3000 V
D-C Grid Voltage -3000 volts
D-C Plate Current
2 A
D-C Plate Current 2.0 amps
D-C Grid Current
0 mA
D-C Grid Current 0.-f amps
Plate Input .o
70000 W
Plate Input .o 70000 watts
Plate Dissipation
20000 W
Plate Dissipation 20000 watts
Plate Dissipation
20000 W
Plate Dissipation ... 20000 watts
D-C Plate Voltage [1]
12000 V
D-C Plate Voltage ... ... 12000 15000 15000 volts D-C Plate Voltage ....ocoenviicenncns 12000 15000 18000 volts
D-C Plate Voltage [2]
15000 V
D-C Plate Voltage ... ... 12000 15000 15000 volts D-C Plate Voltage ....ocoenviicenncns 12000 15000 18000 volts
D-C Plate Voltage [3]
15000 V
D-C Plate Voltage ... ... 12000 15000 15000 volts D-C Plate Voltage ....ocoenviicenncns 12000 15000 18000 volts
D-C Plate Voltage [4]
12000 V
D-C Plate Voltage ... ... 12000 15000 15000 volts D-C Plate Voltage ....ocoenviicenncns 12000 15000 18000 volts
D-C Plate Voltage [5]
15000 V
D-C Plate Voltage ... ... 12000 15000 15000 volts D-C Plate Voltage ....ocoenviicenncns 12000 15000 18000 volts
D-C Plate Voltage [6]
18000 V
D-C Plate Voltage ... ... 12000 15000 15000 volts D-C Plate Voltage ....ocoenviicenncns 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 .. 3.5 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 .. 3.5 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 .. 3.5 3.6 3.6 amps
D-C Plate Current [4]
3.5 A
D-C Plate Current ... 1.5 1.5 2.0 amps D-C Plate Current .. 3.5 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 .. 3.5 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 .. 3.5 3.6 3.6 amps
D-C Grid Voltage [1]
2250 V
D-C Grid Voltage ... 2250 =340 <340 volts D-C Grid Voltage ..... -800 -900 -1000 volts
D-C Grid Voltage [2]
340 V
D-C Grid Voltage ... 2250 =340 <340 volts D-C Grid Voltage ..... -800 -900 -1000 volts
D-C Grid Voltage [3]
340 V
D-C Grid Voltage ... 2250 =340 <340 volts D-C Grid Voltage ..... -800 -900 -1000 volts
D-C Grid Voltage [4]
-800 V
D-C Grid Voltage ... 2250 =340 <340 volts D-C Grid Voltage ..... -800 -900 -1000 volts
D-C Grid Voltage [5]
-900 V
D-C Grid Voltage ... 2250 =340 <340 volts D-C Grid Voltage ..... -800 -900 -1000 volts
D-C Grid Voltage [6]
-1000 V
D-C Grid Voltage ... 2250 =340 <340 volts D-C Grid Voltage ..... -800 -900 -1000 volts
D-C Grid Current, approximate [1]
35 V
D-C Grid Current, approximate ... 35 30 50 ma Peak R-F Grid Voltage ... 1430 1520 1630 volts
D-C Grid Current, approximate [2]
30 V
D-C Grid Current, approximate ... 35 30 50 ma Peak R-F Grid Voltage ... 1430 1520 1630 volts
D-C Grid Current, approximate [3]
50 V
D-C Grid Current, approximate ... 35 30 50 ma Peak R-F Grid Voltage ... 1430 1520 1630 volts
D-C Grid Current, approximate [4]
1430 V
D-C Grid Current, approximate ... 35 30 50 ma Peak R-F Grid Voltage ... 1430 1520 1630 volts
D-C Grid Current, approximate [5]
1520 V
D-C Grid Current, approximate ... 35 30 50 ma Peak R-F Grid Voltage ... 1430 1520 1630 volts
D-C Grid Current, approximate [6]
1630 V
D-C Grid Current, approximate ... 35 30 50 ma Peak R-F Grid Voltage ... 1430 1520 1630 volts
Peak R-F God Voltage o [1]
350 V
Peak R-F God Voltage o 350 395 450 volts D-C Grid Current ..., 0.26 0.25 0.21 amps
Peak R-F God Voltage o [2]
395 V
Peak R-F God Voltage o 350 395 450 volts D-C Grid Current ..., 0.26 0.25 0.21 amps
Peak R-F God Voltage o [3]
450 V
Peak R-F God Voltage o 350 395 450 volts D-C Grid Current ..., 0.26 0.25 0.21 amps