889RA

Forced-air-cooled transmitting triode version of 889A with improved radiator design for high-power RF service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 11 V / 120 A

Description

Forced-air-cooled transmitting triode version of 889A with an improved radiator design.

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: 11 V
Nominal heater current: 120 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

Amplification factor: 21
Max plate voltage: 8500 V
Max plate dissipation: 5000 W
Max cathode current: 2 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
8500 V
Maximum Plate Dissipation
5000 W
Maximum Cathode Current
2 A
Maximum Frequency at Full Rating
40 MHz

Data set 02

1958 Amperex Industrial

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
7500 V
RFPowerAmplifier;ClassC
Plate current
2 A
RFPowerAmplifier;ClassC
Power output
10000 W
RFPowerAmplifier;ClassC
Control-grid voltage
-800 V
RFPowerAmplifier;ClassC
Grid current
240 mA
RFPowerAmplifier;ClassC
Maximum frequency at full input
25 MHz
RFPowerAmplifier

Capacitance

Grid-to-filament capacitance
19.5 pF
Section1
Plate-to-filament capacitance
3 pF
Section1

Data set 03

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
7500 V
RFPowerAmplifier
Plate current
2 A
RFPowerAmplifier
Power output
10000 W
RFPowerAmplifier
Control-grid voltage
-800 V
RFPowerAmplifier
Grid current
240 mA
RFPowerAmplifier
Maximum frequency at full input
25 MHz
RFPowerAmplifier

Capacitance

Grid-to-plate capacitance
20.7 pF
Section1
Grid-to-filament capacitance
19.5 pF
Section1
Plate-to-filament capacitance
3 pF
Section1

Data set 04

1971 Machlette Laboratories

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

The ML [1]
889 kV
The ML-889A and ML-889RA are three electrode tubes Maximum ratings of 8.5 kVdc plate voltage and 16 kW
The ML [2]
889 kV
The ML-889A and ML-889RA are three electrode tubes Maximum ratings of 8.5 kVdc plate voltage and 16 kW
The ML [3]
8.5 kV
The ML-889A and ML-889RA are three electrode tubes Maximum ratings of 8.5 kVdc plate voltage and 16 kW
The ML [4]
16 kV
The ML-889A and ML-889RA are three electrode tubes Maximum ratings of 8.5 kVdc plate voltage and 16 kW
designed specifically for use as modulators, amplifiers or os- plate input apply at frequencies up to
50 MHz
designed specifically for use as modulators, amplifiers or os- plate input apply at frequencies up to 50 Mc for the
cooled anode capable of dissipating [1]
5 kW
cooled anode capable of dissipating 5 kW with 6 gpm with plate voltage and plate input reduced according to the
cooled anode capable of dissipating [2]
6 kW
cooled anode capable of dissipating 5 kW with 6 gpm with plate voltage and plate input reduced according to the
capable of dissipating [1]
5 kW
capable of dissipating 5 kW with an air flow of 500 cfm.
capable of dissipating [2]
500 kW
capable of dissipating 5 kW with an air flow of 500 cfm.
Filament Voltage
11
Filament Voltage ... ............................... 11.0 Vol
Filament Current at [1]
11 V
Filament Current at 11.0 volts ... ............................... 120 Amps
Filament Current at [2]
120 V
Filament Current at 11.0 volts ... ............................... 120 Amps
Filament Starting Current, maximum
180 A
Filament Starting Current, maximum .............................. ............................... 180 Amps
Filament Cold Resistance ..o
8 ohm
Filament Cold Resistance ..o ............................... .008 Ohms
Interclectrode Capacitances ML [1]
889
Interclectrode Capacitances ML-889A ML-889RA
Interclectrode Capacitances ML [2]
889
Interclectrode Capacitances ML-889A ML-889RA
Water flow on anode, minimum for [1]
5 kW
Water flow on anode, minimum for 5 kW dissipation ...... . 6 gpm
Water flow on anode, minimum for [2]
6 kW
Water flow on anode, minimum for 5 kW dissipation ...... . 6 gpm
Maximum outgoing water temperature ... U
70 mA
Maximum outgoing water temperature ... U 70 °C
Air flow on anode, minimum for [1]
5 kW
Air flow on anode, minimum for 5 kW dissipation ........... ............................... 500 cfm ac 0.7 Water™
Air flow on anode, minimum for [2]
500 kW
Air flow on anode, minimum for 5 kW dissipation ........... ............................... 500 cfm ac 0.7 Water™
Air flow on anode, minimum for [3]
0.7 kW
Air flow on anode, minimum for 5 kW dissipation ........... ............................... 500 cfm ac 0.7 Water™
Maximum incoming air temperature
45 mA
Maximum incoming air temperature .............................. ................................ 45 °C
Maximum Anode Temperature, ML [1]
889 mA
Maximum Anode Temperature, ML-889RA . 230 °C
Maximum Anode Temperature, ML [2]
230 mA
Maximum Anode Temperature, ML-889RA . 230 °C
Maximum Glass Temperature
160 mA
Maximum Glass Temperature ... ........................... 160 °C*
* Auxiliary air flow of [1]
30 mA
* Auxiliary air flow of 30 cfm should be directed through a 3” diameter nozzle at the top of the glass envelope to maintain a uniform glass tem-
* Auxiliary air flow of [2]
3 mA
* Auxiliary air flow of 30 cfm should be directed through a 3” diameter nozzle at the top of the glass envelope to maintain a uniform glass tem-
D-C Plas= Voltage
8500 V
D-C Plas= Voltage ... 8500 volts
Max.-Signal D-C Plate Current*
2 A
Max.-Signal D-C Plate Current* 2.0 amps Maximum Ratings, Absolute Values
Max.-Signal Plate Input* [1]
12000 V
Max.-Signal Plate Input* ... ... 12000 watts D-C Plate Voltage 6000 volts
Max.-Signal Plate Input* [2]
6000 V
Max.-Signal Plate Input* ... ... 12000 watts D-C Plate Voltage 6000 volts
Plate Dissipation® [1]
5000 V
Plate Dissipation® ... 5000 watts D-C Grid Voltage —1000 volts
Plate Dissipation® [2]
-1000 V
Plate Dissipation® ... 5000 watts D-C Grid Voltage —1000 volts
D-C Plate Voltage ..........coocc [1]
5000 W
D-C Plate Voltage ..........coocc... 5000 6000 7500 voits Plate Input ... 6000 watts
D-C Plate Voltage ..........coocc [2]
6000 W
D-C Plate Voltage ..........coocc... 5000 6000 7500 voits Plate Input ... 6000 watts
D-C Plate Voltage ..........coocc [3]
7500 W
D-C Plate Voltage ..........coocc... 5000 6000 7500 voits Plate Input ... 6000 watts
D-C Plate Voltage ..........coocc [4]
6000 W
D-C Plate Voltage ..........coocc... 5000 6000 7500 voits Plate Input ... 6000 watts
D-C Grid Voltage [1]
-180 V
D-C Grid Voltage ... ... —180 —230 —300 volts Plate Dissipation 3000 watts
D-C Grid Voltage [2]
-230 V
D-C Grid Voltage ... ... —180 —230 —300 volts Plate Dissipation 3000 watts
D-C Grid Voltage [3]
-300 V
D-C Grid Voltage ... ... —180 —230 —300 volts Plate Dissipation 3000 watts
D-C Grid Voltage [4]
3000 V
D-C Grid Voltage ... ... —180 —230 —300 volts Plate Dissipation 3000 watts
Peak A-F Grid-to-Grid Voltage [1]
1460 V
Peak A-F Grid-to-Grid Voltage 1460 1680 1700 volts ) .
Peak A-F Grid-to-Grid Voltage [2]
1680 V
Peak A-F Grid-to-Grid Voltage 1460 1680 1700 volts ) .
Peak A-F Grid-to-Grid Voltage [3]
1700 V
Peak A-F Grid-to-Grid Voltage 1460 1680 1700 volts ) .
Zero Signal D-C Plate Current [1]
0.4
Zero Signal D-C Plate Current 0.4 0.4 0.4 amp Typical Operation
Zero Signal D-C Plate Current [2]
0.4
Zero Signal D-C Plate Current 0.4 0.4 0.4 amp Typical Operation
Zero Signal D-C Plate Current [3]
0.4
Zero Signal D-C Plate Current 0.4 0.4 0.4 amp Typical Operation
Max.-Signal D-C Plate Current [1]
3.2 V
Max.-Signal D-C Plate Current 3.2 3.6 3.2 amps D-C Plavte Voltage .............................. 5000 6000 volts
Max.-Signal D-C Plate Current [2]
3.6 V
Max.-Signal D-C Plate Current 3.2 3.6 3.2 amps D-C Plavte Voltage .............................. 5000 6000 volts
Max.-Signal D-C Plate Current [3]
3.2 V
Max.-Signal D-C Plate Current 3.2 3.6 3.2 amps D-C Plavte Voltage .............................. 5000 6000 volts
Max.-Signal D-C Plate Current [4]
5000 V
Max.-Signal D-C Plate Current 3.2 3.6 3.2 amps D-C Plavte Voltage .............................. 5000 6000 volts
Max.-Signal D-C Plate Current [5]
6000 V
Max.-Signal D-C Plate Current 3.2 3.6 3.2 amps D-C Plavte Voltage .............................. 5000 6000 volts
Fflective Load Resistance D-C Grid Voltage [1]
-800 V
Fflective Load Resistance D-C Grid Voltage ... .. —800 —900 volts
Fflective Load Resistance D-C Grid Voltage [2]
-900 V
Fflective Load Resistance D-C Grid Voltage ... .. —800 —900 volts
{plate-to-plate) [1]
2520 V
{plate-to-plate) . ... 2520 3680 5000 ohms Peak R-F Grid Voltage ... 1300 1420 volts
{plate-to-plate) [2]
3680 V
{plate-to-plate) . ... 2520 3680 5000 ohms Peak R-F Grid Voltage ... 1300 1420 volts
{plate-to-plate) [3]
5000 V
{plate-to-plate) . ... 2520 3680 5000 ohms Peak R-F Grid Voltage ... 1300 1420 volts
{plate-to-plate) [4]
1300 V
{plate-to-plate) . ... 2520 3680 5000 ohms Peak R-F Grid Voltage ... 1300 1420 volts
{plate-to-plate) [5]
1420 V
{plate-to-plate) . ... 2520 3680 5000 ohms Peak R-F Grid Voltage ... 1300 1420 volts
Max.-Signal Driving Power, D-C Plate Current [1]
0.9 mA
Max.-Signal Driving Power, D-C Plate Current .. ... 0.9 1.0 amp
Max.-Signal Driving Power, D-C Plate Current [2]
1 mA
Max.-Signal Driving Power, D-C Plate Current .. ... 0.9 1.0 amp
approximate [1]
170 mA
approximate . ... 170 180 150 waus D( G“d Current, approx. e 0012 0.10 amp
approximate [2]
180 mA
approximate . ... 170 180 150 waus D( G“d Current, approx. e 0012 0.10 amp
approximate [3]
150 mA
approximate . ... 170 180 150 waus D( G“d Current, approx. e 0012 0.10 amp
approximate [4]
12 mA
approximate . ... 170 180 150 waus D( G“d Current, approx. e 0012 0.10 amp
approximate [5]
0.1 mA
approximate . ... 170 180 150 waus D( G“d Current, approx. e 0012 0.10 amp
Max.-Signal Power Output, Driving Power, approx [1]
155 mA
Max.-Signal Power Output, Driving Power, approx. .......................... 155 140 watts
Max.-Signal Power Output, Driving Power, approx [2]
140 mA
Max.-Signal Power Output, Driving Power, approx. .......................... 155 140 watts
approximate [1]
8800 mA
approximate ... 8800 12000 15000 watts Power Qutput, approx. ... 2750 4000 watts
approximate [2]
12000 mA
approximate ... 8800 12000 15000 watts Power Qutput, approx. ... 2750 4000 watts
approximate [3]
15000 mA
approximate ... 8800 12000 15000 watts Power Qutput, approx. ... 2750 4000 watts
approximate [4]
2750 mA
approximate ... 8800 12000 15000 watts Power Qutput, approx. ... 2750 4000 watts
approximate [5]
4000 mA
approximate ... 8800 12000 15000 watts Power Qutput, approx. ... 2750 4000 watts
Cartier conditions per tube with a maximum D.C Plate Voltage
8500 mA
Cartier conditions per tube with a maximum D.C Plate Voltage 8500
D-C Plate Voltage [1]
8500 V
D-C Plate Voltage 8500 volts Plate Input ' 16000 watts
D-C Plate Voltage [2]
16000 V
D-C Plate Voltage 8500 volts Plate Input ' 16000 watts
D-C Plate Current
1 A
D-C Plate Current ............... 1. amps ¢ TS watts
Plate Input [1]
7500 W
Plate Input . ... 7500 watts Plate Dissipation 5000