Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

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

AX9904

Industrial transmitting power triode intended for RF amplification, oscillation, or modulation. Manufacturer data emphasize substantial plate power, professional transmitter operation, and construction suited to continuous high-power service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
12.6 V / 33 A

Description

AX9904 is listed in the supplied Amperex power-tube table as a transmitting power triode, with published filament, dissipation, operating, output-power, and frequency data.

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
12.6 V
Nominal heater current
33 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
32
Max plate voltage
6000 V
Max plate dissipation
6000 W

Electrical values extracted from the supplied source table; typical operating values are preserved in TUBE_SECTION_PARAMETER.

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

1958 Amperex Industrial

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Filament voltage

    12.6 V

    Published transmitting-tube rating

  • Filament current

    33 A

    Published transmitting-tube rating

  • Amplification factor

    32

    Published power-tube table

Other

  • Maximum plate dissipation

    6000 W

    Published power-tube table

  • Plate voltage

    6000 V

    TransmittingService

  • Plate current

    1.5 A

    TransmittingService

  • Power output

    6900 W

    TransmittingService

  • Grid bias

    -400 V

    TransmittingService

  • Grid current

    310 mA

    TransmittingService

  • Maximum frequency

    75 MHz

    FullInputWatts