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

8795

Massive water-cooled general-purpose transmitting triode for high-power RF amplifier and oscillator service. Rated for approximately 140 kW plate dissipation and 20 kV plate voltage, with continuous RF output reaching roughly 240 kW.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
16.5 V / 325 A

Description

The ML-8795 and ML-8796 are high-power, general-pur- When operated as class C amplifiers or oscillators, these pose triodes. The ML-8795 is water cooled and the ML-8796 tubes will produce a continuous output of up to 240 kW. The same. The cathodes of these tubes consist of sturdy thoriated- can be operated in air at maximum plate voltage ratings. Maxi- tungsten filaments. The coaxial terminals have low inductance mum ratings apply at frequencies up to 30 MHz; useful and high heat dissipation capability. Low-loss alumina ce- power output can be obtained at higher frequencies with a ramics are used for all envelope insulation members. reduction in plate volrage. Filament Voltage (AC) ....................................................... 165 V

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
16.5 V
Nominal heater current
325 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
40
Max plate voltage
20000 V
Max plate dissipation
140000 W

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

1971 Machlette Laboratories

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • The ML [1]

    8795

    The ML-8795 and ML-8796 are high-power, general-pur- When operated as class C amplifiers or oscillators, these

  • The ML [2]

    8796

    The ML-8795 and ML-8796 are high-power, general-pur- When operated as class C amplifiers or oscillators, these

  • pose triodes. The ML [1]

    8795 kW

    pose triodes. The ML-8795 is water cooled and the ML-8796 tubes will produce a continuous output of up to 240 kW. The

  • pose triodes. The ML [2]

    8796 kW

    pose triodes. The ML-8795 is water cooled and the ML-8796 tubes will produce a continuous output of up to 240 kW. The

  • pose triodes. The ML [3]

    240 kW

    pose triodes. The ML-8795 is water cooled and the ML-8796 tubes will produce a continuous output of up to 240 kW. The

  • Filament Voltage (AC)

    165

    Filament Voltage (AC) ....................................................... 165 V

  • Filament Current

    325

    Filament Current ................................. 325 A

  • Filament Starting Current, maximum

    800 mA

    Filament Starting Current, maximum 800 A

  • Filament Cold Resistance

    52

    Filament Cold Resistance ................................ ................. 0052 ohm

  • Amplification Factor

    40

    Amplification Factor ... ........................................................ 40

  • Maximum water inlet pressure

    80 mA

    Maximum water inlet pressure ... ........................................................ 80 psi

  • Maximum outgoing water temperature

    70 mA

    Maximum outgoing water temperature ... .. ........................................................ 70 °C

  • Water flow on anode for [1]

    140 kW

    Water flow on anode for 140 kW dissipation 40 gpm

  • Water flow on anode for [2]

    40 kW

    Water flow on anode for 140 kW dissipation 40 gpm

  • Water jacket pressure drop for [1]

    40 gpm

    Water jacket pressure drop for 40 gpm flow . ... 25 psi

  • Water jacket pressure drop for [2]

    25 gpm

    Water jacket pressure drop for 40 gpm flow . ... 25 psi

  • Maximum Envelope Temperature

    200 mA

    Maximum Envelope Temperature ................... ......................................................... 200 °C

  • WARNING: This electron tube when operating at peak voltages in excess of

    15 mA

    WARNING: This electron tube when operating at peak voltages in excess of 15 kv may give off x rays, which can be harmful

  • Small Filament Connector ..................c...oooveveiiiiieie F

    27218 mA

    Small Filament Connector ..................c...oooveveiiiiieie F-27218 tion to the removal of power from tubes during fault condi-

  • DC Plate Voltage .........ccc.ooeivveiiiiiiiiecec,

    20

    DC Plate Voltage .........ccc.ooeivveiiiiiiiiecec, 20 kv protection device, refer to the references listed.

  • DC Grid Voltage .........coocooovvioeiiiieiieiee

    -3200

    DC Grid Voltage .........coocooovvioeiiiieiieiee —3200 A nominal value of resistance must be placed in the plate

  • DC Plate Current ........cocooovviieiiieiiiieiinc e

    20

    DC Plate Current ........cocooovviieiiieiiiieiinc e 20 lead of the tube being protected in order to be assured that

  • Grid Dissipation ................oocoiiiiiii i

    2500

    Grid Dissipation ................oocoiiiiiii i 2500

  • Plate Dissipation ...............c.oc.oooiiiiiiiiiiii

    140

    Plate Dissipation ...............c.oc.oooiiiiiiiiiiii 140

  • DC Grid Voltage .........cccooeivomiiiiiiiee,

    -1200

    DC Grid Voltage .........cccooeivomiiiiiiiee, —1200

  • Peak RF Plate Voltage ..........ccocooevvrereniiiereannene

    14

    Peak RF Plate Voltage ..........ccocooevvrereniiiereannene 14 kv

  • Peak RF Grid Voltage ............coccooviiiiiiiicecene

    1900

    Peak RF Grid Voltage ............coccooviiiiiiiicecene 1900

  • DC Grid Current, approximate ...........cccecocvooeeeenn

    3.5 mA

    DC Grid Current, approximate ...........cccecocvooeeeenn.. 3.5

  • RF Load Resistance

    410

    RF Load Resistance 410 the tube electrodes.

  • Driving Power, approximate ...............cc.cceeunennn

    6500 mA

    Driving Power, approximate ...............cc.cceeunennn. 6500

  • Plate Dissipation ..............ccccoeeeeviiiiieeieiiieeieens

    83

    Plate Dissipation ..............ccccoeeeeviiiiieeieiiieeieens 83

  • Published value

    1

    1. W. N. Parker and M. V. Hoover, “"Gas Tubes Protect High Power

  • e cceeeerr e [1]

    240 kW

    e cceeeerr e 240 kw 2. H. D. Doolittle, “High Power Hydrogen Thyratrons”, Cathode

  • e cceeeerr e [2]

    2 kW

    e cceeeerr e 240 kw 2. H. D. Doolittle, “High Power Hydrogen Thyratrons”, Cathode

  • Power Gainl ...oovveiviiiiiicce e [1]

    37

    Power Gainl ...oovveiviiiiiicce e 37 Press, 1, 6, 1954.

  • Power Gainl ...oovveiviiiiiicce e [2]

    1

    Power Gainl ...oovveiviiiiiicce e 37 Press, 1, 6, 1954.

  • Power Gainl ...oovveiviiiiiicce e [3]

    6

    Power Gainl ...oovveiviiiiiicce e 37 Press, 1, 6, 1954.

  • Power Gainl ...oovveiviiiiiicce e [4]

    1954

    Power Gainl ...oovveiviiiiiicce e 37 Press, 1, 6, 1954.

  • LT U PLATE VOLTAGE =—KILOVOLTS! [1]

    0 kV

    LT U PLATE VOLTAGE =—KILOVOLTS! 0. 0 7 ]

  • LT U PLATE VOLTAGE =—KILOVOLTS! [2]

    0 kV

    LT U PLATE VOLTAGE =—KILOVOLTS! 0. 0 7 ]

  • LT U PLATE VOLTAGE =—KILOVOLTS! [3]

    7 kV

    LT U PLATE VOLTAGE =—KILOVOLTS! 0. 0 7 ]