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

8907

Forced-air-cooled rugged planar triode for continuous or pulsed oscillator, multiplier, modulator, and regulator service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6 V / 1 A

Description

The EIMAC 8907 is a forced-air-cooled rugged planar triode for cw or pulsed oscillator, multiplier, modulator, and regulator service.

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: 6 V
Nominal heater current: 1 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: 0.038 S
Amplification factor: 80
Max plate voltage: 4500 V
Max plate dissipation: 100 W
Max grid dissipation: 1.5 W
Max cathode current: 7.5 A

Promoted values are taken from printed General Characteristics / Maximum Ratings. Additional published conditions and operating data are preserved 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

1962 Eimac

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

Grid-Cathode Capacitance
8 pF
Grid-Plate Capacitance
1.98 pF
Plate-Cathode Capacitance
0.06 pF

Other

Frequency CW Maximum
2.5 GHz
Peak Pulse Plate Voltage
4500 V
Pulse Plate Current
5 A

Data set 02

1971 Machlette Laboratories

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

service at frequencies up to
3 mA
service at frequencies up to 3 GHz. They may also be used spew shields to minimize changes in grid-plate capacitance
The ML
8907
The ML-8907 is fitted with a radiator for forced-air cooling. current capability, Jow interelectrode capacitance, high trans-
Transconductance (Ib= [1]
100 mA
Transconductance (Ib=100 mA, Eb=600 V) ..............
Transconductance (Ib= [2]
600 mA
Transconductance (Ib=100 mA, Eb=600 V) ..............
Maximum Envelope or Anode Temperature
250 mA
Maximum Envelope or Anode Temperature .................... 250 °C
CW RF Power Oscillator or Amplifier — Class C Driving Power during Pulse
400
CW RF Power Oscillator or Amplifier — Class C Driving Power during Pulse ... 400
Useful Peak Power Qutput, approximate
2.5 mA
Useful Peak Power Qutput, approximate ................ 2.5
Maximum Ratings, Absolute Values Typical Operation, Grid-Pulsed RE Oscillator, ML
8906 mA
Maximum Ratings, Absolute Values Typical Operation, Grid-Pulsed RE Oscillator, ML-8906/AL
DC Plate Voltage [1]
2500
DC Plate Voltage 2500 FreQuency ........ccooooiiiiiiiiiii e, 1.1
DC Plate Voltage [2]
1.1
DC Plate Voltage 2500 FreQuency ........ccooooiiiiiiiiiii e, 1.1
DC Grid Voltage -—~ [1]
150
DC Grid Voltage -—~150 Heater Voltage ... 5.7
DC Grid Voltage -—~ [2]
5.7
DC Grid Voltage -—~150 Heater Voltage ... 5.7
Grid negative to cathode Duty Factor ...t
0.001
Grid negative to cathode Duty Factor ...t 0.001
DC Plate Voltage ..........ooooiniiiiiiiiiniiieiie
2000
DC Plate Voltage ..........ooooiniiiiiiiiiniiieiie 2000
Grid positive to cathode ... DC Grid Voltage ........cocooeviviiiiiiiniiiieieee e
-75
Grid positive to cathode ... DC Grid Voltage ........cocooeviviiiiiiiniiiieieee e —75
DC Plate Current Peak Video Plate Current ...............cc.oooeivviiieeeiinn,
1.1
DC Plate Current Peak Video Plate Current ...............cc.oooeivviiieeeiinn, 1.1
Plate Dissipation Peak Video Grid Current
8
Plate Dissipation Peak Video Grid Current ..................... .8
Forced-air cooling (ML [1]
8907 mA
Forced-air cooling (ML-8907) ... ... 100 Useful Peak Power Output, approximate .............. 850
Forced-air cooling (ML [2]
100 mA
Forced-air cooling (ML-8907) ... ... 100 Useful Peak Power Output, approximate .............. 850
Forced-air cooling (ML [3]
850 mA
Forced-air cooling (ML-8907) ... ... 100 Useful Peak Power Output, approximate .............. 850
Conduction and convection (ML [1]
8906
Conduction and convection (ML-8906, Typical Operation, Plate-Pulsed RF Amplifier, ML-8906/AL
Conduction and convection (ML [2]
8906
Conduction and convection (ML-8906, Typical Operation, Plate-Pulsed RF Amplifier, ML-8906/AL
Grid Dissipation [1]
1.5
Grid Dissipation ... 1.5 Heater Voltage ......... 5.7
Grid Dissipation [2]
5.7
Grid Dissipation ... 1.5 Heater Voltage ......... 5.7
Frequency ..o [1]
2.5 GHz
Frequency ..o 2.5 GHz Pulse DUration .........ccccoooeivieiiiiiiiiiiaeieeice 3.5
Frequency ..o [2]
3.5 GHz
Frequency ..o 2.5 GHz Pulse DUration .........ccccoooeivieiiiiiiiiiiaeieeice 3.5
Typical Operation, Cathode Drive Amplifier Duty Factor
0.001
Typical Operation, Cathode Drive Amplifier Duty Factor ... 0.001
e [1]
7 GHz
e 7 GHz Peak Plate Pulse Supply Voltage .............. 2000
e [2]
2000 GHz
e 7 GHz Peak Plate Pulse Supply Voltage .............. 2000
DC Plate Voltage
630
DC Plate Voltage ................. 630 DC Grid Voltage ......cc.ocooovoviovieiiieceeceee
DC Grid Voltage, approximate [1]
-5 mA
DC Grid Voltage, approximate —5 Peak Video Plate Current ... 2
DC Grid Voltage, approximate [2]
2 mA
DC Grid Voltage, approximate —5 Peak Video Plate Current ... 2
DC Cathode Current [1]
140
DC Cathode Current ................ 140 Peak Video Grid Curtent ... 1
DC Cathode Current [2]
1
DC Cathode Current ................ 140 Peak Video Grid Curtent ... 1
DC Grid Current [1]
25
DC Grid Current ........ 25 Driving Power ........cooooiiiiiiiiii 300
DC Grid Current [2]
300
DC Grid Current ........ 25 Driving Power ........cooooiiiiiiiiii 300
Driving Power, approximate [1]
4 mA
Driving Power, approximate 4 Useful Peak Power Output, approximate ................. 2
Driving Power, approximate [2]
2 mA
Driving Power, approximate 4 Useful Peak Power Output, approximate ................. 2
Useful Power Qutput .........................cocoiii [1]
45
Useful Power Qutput .........................cocoiii 45 Typical Operation, Plate-Pulsed RF Oscillator, ML-8906, ML-8907
Useful Power Qutput .........................cocoiii [2]
8906
Useful Power Qutput .........................cocoiii 45 Typical Operation, Plate-Pulsed RF Oscillator, ML-8906, ML-8907
Useful Power Qutput .........................cocoiii [3]
8907
Useful Power Qutput .........................cocoiii 45 Typical Operation, Plate-Pulsed RF Oscillator, ML-8906, ML-8907
Frequency
2.5
Frequency ... 2.5 Heater Voltage ..
Heater Voltage
5
Heater Voltage ... 5.0 Pulse Duration ...
DC Plate Voltage
1000
DC Plate Voltage ... 1000 Duty Factor
DC Grid Voltage, approximate U TORTS -~
20 mA
DC Grid Voltage, approximate U TORTS -~20 Peak Plate Pulse Supply Voltage ...............
DC Plate Current
140
DC Plate Current ... 140 Peak Video Plate Cutrent ........................
DC Grid Current, approximate
30 mA
DC Grid Current, approximate ... 30 Peak Video Grid Current .......oocvvnveiienee
Useful Power Qutput ....................coooiiiiei
30 mA
Useful Power Qutput ....................coooiiiiei 30 Useful Peak Power Qutput, approximate
* The heater voltage is reduced approximately
15 mA
* The heater voltage is reduced approximately 15% in this application
ML [1]
8906
ML-8906, ML-8907 ..., 200 Cutoft Amplification Factor ...

Data set 03

1975 Eimac Tube Manual

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Heater voltage nominal
6 V
Heater current nominal
1 A
Transconductance
38000 uS
Amplification factor
80

Capacitance

Input/grid-cathode capacitance
8 pF
Output/plate-cathode capacitance
1.98 pF
Grid-plate/feedback capacitance
0.06 pF

Other

Maximum plate voltage
4500 V
Maximum plate dissipation
100 W
Maximum grid dissipation
1.5 W
Maximum cathode or pulse plate current
7.5 A
Maximum rated frequency
3 GHz
CW DC plate voltage
2500 V
CW
CW DC plate current
150 mA
CW
CW DC grid current
45 mA
CW
Forced-air plate dissipation
100 W
8907
Representative DC plate voltage
1000 V
GroundedGridCWOscillator
Representative useful CW output
30 W
GroundedGridCWOscillator
Representative frequency
2.5 GHz
GroundedGridCWOscillator
Pulse peak plate voltage
4500 V
Pulse
Pulse grid current
2.5 A
Pulse
Pulse duration
6 us
Pulse

Data set 04

1976 Eimac Tube Manual

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Heater voltage nominal
6 V
Heater current nominal
1 A
Transconductance
38000 uS
Amplification factor
80

Capacitance

Input/grid-cathode capacitance
8 pF
Output/plate-cathode capacitance
1.98 pF
Grid-plate/feedback capacitance
0.06 pF

Other

Maximum plate voltage
4500 V
Maximum plate dissipation
100 W
Maximum grid dissipation
1.5 W
Maximum cathode or pulse plate current
7.5 A
Maximum rated frequency
3 GHz
CW DC plate voltage
2500 V
CW
CW DC plate current
150 mA
CW
CW DC grid current
45 mA
CW
Forced-air plate dissipation
100 W
8907
Representative DC plate voltage
1000 V
GroundedGridCWOscillator
Representative useful CW output
30 W
GroundedGridCWOscillator
Representative frequency
2.5 GHz
GroundedGridCWOscillator
Pulse peak plate voltage
4500 V
Pulse
Pulse grid current
2.5 A
Pulse
Pulse duration
6 us
Pulse