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

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

7328

Forced-air-cooled directly heated power triode for Class-AB1 audio-frequency power-amplifier and modulator service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
7 V / 26 A

Description

The ITT F-7328 is a forced-air-cooled directly heated power triode for class-ab1 audio-frequency power-amplifier and modulator 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
7 V
Nominal heater current
26 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
5.5
Max plate voltage
8000 V
Max plate dissipation
20000 W

Audio-frequency maximum ratings promoted; pulse ratings retained as 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 ITT

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Amplification factor

    5.5

Capacitance

  • Grid-plate capacitance

    88 pF

  • Grid-filament capacitance

    10 pF

  • Plate-filament capacitance

    12 pF

Other

  • Maximum plate dissipation

    20000 W

  • Maximum audio-frequency DC plate voltage

    8000 V

  • Filament starting current

    1000 A

  • Required airflow at 20 kW plate dissipation

    1700 cfm

  • Pulse cathode current maximum

    100 A

  • Pulse DC plate voltage maximum

    20000 V