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Power - Triode (over 1000V 100W) ·Triode

891R

Forced-air-cooled version of the 891 high-power transmitting triode for modulator, amplifier, and oscillator service. Rated for approximately 4 kW plate dissipation and 10 kV plate voltage in professional transmitting equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 22 V / 60 A

Description

Forced-air-cooled version of the 891 high-power transmitting triode.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 22 V
Nominal heater current: 60 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.004 S
Amplification factor: 8.5
Max plate voltage: 10000 V
Max plate dissipation: 4000 W
Max cathode current: 2.5 A

Promoted ratings/characteristics mapped from printed headings; device/service-specific values retained in parameters.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1950 General Electric Transmitting Types

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Maximum Plate Voltage
15000 V
Maximum Plate Dissipation
6000 W
Maximum Cathode Current
2.5 A

Data set 02

1953 Amperex

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater/Filament Voltage
22 V
Published datasheet value
Heater/Filament Current
120 A
Published datasheet value
Maximum Plate/Anode Voltage
10000 V
Published datasheet value
Maximum Plate/Anode Dissipation
5000 W
Published datasheet value

Characteristic

Transconductance
4000 µS
Published datasheet value
Amplification Factor
8
Published datasheet value

Data set 03

1958 Amperex Industrial

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
10000 V
RFPowerAmplifier;ClassC
Plate current
1.4 A
RFPowerAmplifier;ClassC
Power output
10000 W
RFPowerAmplifier;ClassC
Control-grid voltage
-2000 V
RFPowerAmplifier;ClassC
Grid current
150 mA
RFPowerAmplifier;ClassC
Maximum frequency at full input
1.6 MHz
RFPowerAmplifier

Capacitance

Grid-to-plate capacitance
30 pF
Section1
Grid-to-filament capacitance
16 pF
Section1
Plate-to-filament capacitance
3 pF
Section1

Data set 04

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
10000 V
RFPowerAmplifier
Plate current
1.4 A
RFPowerAmplifier
Power output
10000 W
RFPowerAmplifier
Control-grid voltage
-2000 V
RFPowerAmplifier
Grid current
150 mA
RFPowerAmplifier
Maximum frequency at full input
1.6 MHz
RFPowerAmplifier

Capacitance

Grid-to-plate capacitance
30 pF
Section1
Grid-to-filament capacitance
16 pF
Section1
Plate-to-filament capacitance
3 pF
Section1

Data set 05

1971 Machlette Laboratories

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

The ML [1]
891 kV
The ML-891 and ML-891R are three electrode tubes mately 450 c¢fm. Maximum ratings of 12 kVdc plate voltage
The ML [2]
891 kV
The ML-891 and ML-891R are three electrode tubes mately 450 c¢fm. Maximum ratings of 12 kVdc plate voltage
The ML [3]
450 kV
The ML-891 and ML-891R are three electrode tubes mately 450 c¢fm. Maximum ratings of 12 kVdc plate voltage
The ML [4]
12 kV
The ML-891 and ML-891R are three electrode tubes mately 450 c¢fm. Maximum ratings of 12 kVdc plate voltage
designed specifically for use as modulators, amplifiers or and [1]
18 kV
designed specifically for use as modulators, amplifiers or and 18 kW plate input for the ML-891 and 10 kVdc plate
designed specifically for use as modulators, amplifiers or and [2]
891 kV
designed specifically for use as modulators, amplifiers or and 18 kW plate input for the ML-891 and 10 kVdc plate
designed specifically for use as modulators, amplifiers or and [3]
10 kV
designed specifically for use as modulators, amplifiers or and 18 kW plate input for the ML-891 and 10 kVdc plate
oscillators in radio transmitting service. The cathode of each voltage and [1]
15 kW
oscillators in radio transmitting service. The cathode of each voltage and 15 kW plate input for the ML-891R apply at
oscillators in radio transmitting service. The cathode of each voltage and [2]
891 kW
oscillators in radio transmitting service. The cathode of each voltage and 15 kW plate input for the ML-891R apply at
cooled anode capable of dissipating
6 kW
cooled anode capable of dissipating 6 kW with moderate with plate voltage and plate input reduced according to the
capable of dissipating
4 kW
capable of dissipating 4 kW with an air flow of approxi-
Filament Voltage
22 V
Filament Voltage 22 Volts
Filament Current
60 A
Filament Current 60 Amps
Filament Starting Current, maximum
120 A
Filament Starting Current, maximum ... ...................... 120 Amps
Filament Cold Resistance
0.031 ohm
Filament Cold Resistance ... ................................ 0.031 Ohms
Amplification Factor
8.5
Amplification Factor ... ............................ 8.5
Interelectrode Capacitances: ML [1]
891
Interelectrode Capacitances: ML-891 ML-891R
Interelectrode Capacitances: ML [2]
891
Interelectrode Capacitances: ML-891 ML-891R
Water flow on anode [1]
3 gpm
Water flow on anode ... ... 3-8 gpm
Water flow on anode [2]
-8 gpm
Water flow on anode ... ... 3-8 gpm
Maximum water pressure
80 mA
Maximum water pressure ... 80 psi
Maximum outgoing water temperature
70 mA
Maximum outgoing water temperature .. 70 °C
Air flow on anode, minimum for [1]
4 kW
Air flow on anode, minimum for 4 kW dissipation .......... 450 cfm at 0.5” Water
Air flow on anode, minimum for [2]
450 kW
Air flow on anode, minimum for 4 kW dissipation .......... 450 cfm at 0.5” Water
Air flow on anode, minimum for [3]
0.5 kW
Air flow on anode, minimum for 4 kW dissipation .......... 450 cfm at 0.5” Water
Maximum incoming air temperature
45 mA
Maximum incoming air temperature ..... 45 °C
Maximum Glass Temperature ...,
160 mA
Maximum Glass Temperature ..., .................... 160 °C
D-C Platc Voltage ..............ccooocns [1]
15000 V
D-C Platc Voltage ..............ccooocns 15000 10000 volts Maxi Rati ) ]
D-C Platc Voltage ..............ccooocns [2]
10000 V
D-C Platc Voltage ..............ccooocns 15000 10000 volts Maxi Rati ) ]
Max.-Signal D-C Plate Current* [1]
2 A
Max.-Signal D-C Plate Current* ...... 2.0 2.0 amps "‘D"fg’“}‘,’l‘ate‘*g‘;ﬁgfzbsomte Valuef A%Lo%;;)‘ Mgggg)k ol
Max.-Signal D-C Plate Current* [2]
2 A
Max.-Signal D-C Plate Current* ...... 2.0 2.0 amps "‘D"fg’“}‘,’l‘ate‘*g‘;ﬁgfzbsomte Valuef A%Lo%;;)‘ Mgggg)k ol
Max.-Signa( Plate Input’ [1]
20000 V
Max.-Signa( Plate Input’ .................. 20000 10500 watts D-C Gl’ld Vol(age _3000 _3000 volts
Max.-Signa( Plate Input’ [2]
10500 V
Max.-Signa( Plate Input’ .................. 20000 10500 watts D-C Gl’ld Vol(age _3000 _3000 volts
Max.-Signa( Plate Input’ [3]
3000 V
Max.-Signa( Plate Input’ .................. 20000 10500 watts D-C Gl’ld Vol(age _3000 _3000 volts
Max.-Signa( Plate Input’ [4]
3000 V
Max.-Signa( Plate Input’ .................. 20000 10500 watts D-C Gl’ld Vol(age _3000 _3000 volts
Plate Dissipation™® [1]
5000 A
Plate Dissipation™® ... 5000 3500 watts D-C Plate Current . . .. .. 1.0 1.0 amps
Plate Dissipation™® [2]
3500 A
Plate Dissipation™® ... 5000 3500 watts D-C Plate Current . . .. .. 1.0 1.0 amps
Plate Dissipation™® [3]
1 A
Plate Dissipation™® ... 5000 3500 watts D-C Plate Current . . .. .. 1.0 1.0 amps
Plate Dissipation™® [4]
1 A
Plate Dissipation™® ... 5000 3500 watts D-C Plate Current . . .. .. 1.0 1.0 amps
Typical Operation (Values are for [1]
2
Typical Operation (Values are for 2 tubes) ML-891 I?l-c C;rid Current ... 806(1)(5) 800(1)?) amp
Typical Operation (Values are for [2]
891
Typical Operation (Values are for 2 tubes) ML-891 I?l-c C;rid Current ... 806(1)(5) 800(1)?) amp
Typical Operation (Values are for [3]
806
Typical Operation (Values are for 2 tubes) ML-891 I?l-c C;rid Current ... 806(1)(5) 800(1)?) amp
Typical Operation (Values are for [4]
1
Typical Operation (Values are for 2 tubes) ML-891 I?l-c C;rid Current ... 806(1)(5) 800(1)?) amp
Typical Operation (Values are for [5]
5
Typical Operation (Values are for 2 tubes) ML-891 I?l-c C;rid Current ... 806(1)(5) 800(1)?) amp
Typical Operation (Values are for [6]
800
Typical Operation (Values are for 2 tubes) ML-891 I?l-c C;rid Current ... 806(1)(5) 800(1)?) amp
Typical Operation (Values are for [7]
1
Typical Operation (Values are for 2 tubes) ML-891 I?l-c C;rid Current ... 806(1)(5) 800(1)?) amp
N-C Plate Voltage [1]
3000 V
N-C Plate Voltage .. .. ... 3000 12500 volts ate lnput ... . .. watts
N-C Plate Voltage [2]
12500 V
N-C Plate Voltage .. .. ... 3000 12500 volts ate lnput ... . .. watts
Peak A-F Grid to Grid Voltage [1]
2260 V
Peak A-F Grid to Grid Voltage . 2260 3760 volts YI%-C Plgte VoTta 6000 8000 volts
Peak A-F Grid to Grid Voltage [2]
3760 V
Peak A-F Grid to Grid Voltage . 2260 3760 volts YI%-C Plgte VoTta 6000 8000 volts
Peak A-F Grid to Grid Voltage [3]
6000 V
Peak A-F Grid to Grid Voltage . 2260 3760 volts YI%-C Plgte VoTta 6000 8000 volts
Peak A-F Grid to Grid Voltage [4]
8000 V
Peak A-F Grid to Grid Voltage . 2260 3760 volts YI%-C Plgte VoTta 6000 8000 volts
Zero Signal D-C Plate Current [1]
0.5
Zero Signal D-C Plate Current ... 0.5 04 amp DC Grid Voltagee """""""""" : —2000 —2400 v:lts
Zero Signal D-C Plate Current [2]
4
Zero Signal D-C Plate Current ... 0.5 04 amp DC Grid Voltagee """""""""" : —2000 —2400 v:lts
Zero Signal D-C Plate Current [3]
-2000
Zero Signal D-C Plate Current ... 0.5 04 amp DC Grid Voltagee """""""""" : —2000 —2400 v:lts
Zero Signal D-C Plate Current [4]
-2400
Zero Signal D-C Plate Current ... 0.5 04 amp DC Grid Voltagee """""""""" : —2000 —2400 v:lts
Max.-Signal D-C Plate Current [1]
2.1 V
Max.-Signal D-C Plate Current .......... 2.1 2.5 amps Peak R-F Grid %/oltae """ - 2650 3100 volts
Max.-Signal D-C Plate Current [2]
2.5 V
Max.-Signal D-C Plate Current .......... 2.1 2.5 amps Peak R-F Grid %/oltae """ - 2650 3100 volts
Max.-Signal D-C Plate Current [3]
2650 V
Max.-Signal D-C Plate Current .......... 2.1 2.5 amps Peak R-F Grid %/oltae """ - 2650 3100 volts
Max.-Signal D-C Plate Current [4]
3100 V
Max.-Signal D-C Plate Current .......... 2.1 2.5 amps Peak R-F Grid %/oltae """ - 2650 3100 volts
Eff. Load Resistance, Plate to Plate [1]
8000 ohm
Eff. Load Resistance, Plate to Plate .. 8000 12000 ohms D.C Plate Currenc B¢ - 0.5 0.78 am
Eff. Load Resistance, Plate to Plate [2]
12000 ohm
Eff. Load Resistance, Plate to Plate .. 8000 12000 ohms D.C Plate Currenc B¢ - 0.5 0.78 am
Eff. Load Resistance, Plate to Plate [3]
0.5 ohm
Eff. Load Resistance, Plate to Plate .. 8000 12000 ohms D.C Plate Currenc B¢ - 0.5 0.78 am
Eff. Load Resistance, Plate to Plate [4]
0.78 ohm
Eff. Load Resistance, Plate to Plate .. 8000 12000 ohms D.C Plate Currenc B¢ - 0.5 0.78 am
Max.-Signal Driving Power, approx [1]
50 mA
Max.-Signal Driving Power, approx. .. 50 245 watts D-C Grid Current, apptox. .. 0 1 0.08 amp
Max.-Signal Driving Power, approx [2]
245 mA
Max.-Signal Driving Power, approx. .. 50 245 watts D-C Grid Current, apptox. .. 0 1 0.08 amp
Max.-Signal Driving Power, approx [3]
0 mA
Max.-Signal Driving Power, approx. .. 50 245 watts D-C Grid Current, apptox. .. 0 1 0.08 amp
Max.-Signal Driving Power, approx [4]
1 mA
Max.-Signal Driving Power, approx. .. 50 245 watts D-C Grid Current, apptox. .. 0 1 0.08 amp
Max.-Signal Driving Power, approx [5]
0.08 mA
Max.-Signal Driving Power, approx. .. 50 245 watts D-C Grid Current, apptox. .. 0 1 0.08 amp
Max.-Signal Power Output, approx [1]
10000 mA
Max.-Signal Power Output, approx. .. 10000 22000 watts Driving Power ap,prg)l(). o 260 260 wags
Max.-Signal Power Output, approx [2]
22000 mA
Max.-Signal Power Output, approx. .. 10000 22000 watts Driving Power ap,prg)l(). o 260 260 wags
Max.-Signal Power Output, approx [3]
260 mA
Max.-Signal Power Output, approx. .. 10000 22000 watts Driving Power ap,prg)l(). o 260 260 wags
Max.-Signal Power Output, approx [4]
260 mA
Max.-Signal Power Output, approx. .. 10000 22000 watts Driving Power ap,prg)l(). o 260 260 wags