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Tube Tinker — Electron Tube Database
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Power - Beam (NOT sweep) ·BeamPower

40RS40

High-current pulse tetrode with approximately 60 W anode dissipation, designed for pulse operation and pulse-generation service with very short duty-cycle pulses.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
4
Nominal heater
25 V / 2.55 A

Description

Pulse tetrode with 60 W anode dissipation for pulse operation and pulse-generation service.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
-
Base pins
4
Nominal heater voltage
25 V
Nominal heater current
2.55 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

Beam Power

X-ray radiationInterelectrode capacitances
Max plate voltage
20000 V
Max screen voltage
1300 V
Max plate dissipation
60 W
Max screen dissipation
8 W
Max grid dissipation
6 W
Max cathode current
150 mA

Published ratings/characteristics promoted from the approved source.

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

195X Tesla

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • HeaterVoltageNominal

    25 V

    Nominal

  • HeaterCurrentNominal

    2.55 A

    Nominal

  • Maximum Plate Voltage

    20000 V

  • Maximum Screen Voltage

    1300 V

  • Maximum Plate Dissipation

    60 W

  • Maximum Screen Dissipation

    8 W

  • Peak Anode Current

    15 A

    Pulse

  • MaximumPulseDuration

    2 us

    Pulse

Data set 02

1966 Tesla Tubes

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • Heater current

    2.3 A to 2.8 A

    AC or DC

  • Maximum anode current

    15 mA

  • Maximum peak anode current

    15 A

    Pulse

  • Maximum negative grid-filament voltage

    750-800 V

  • Maximum control-grid voltage

    250 V

  • Maximum pulse duration

    2 us

    Pulse

  • Maximum duty factor

    0.001

    Pulse

  • Maximum seal/base/cap temperature

    180 degC

    Cooling

Capacitance

  • Grid-filament capacitance

    43 pF

  • Anode-related capacitance

    0.33 pF

    OCR label partly damaged; value clearly published