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Power - Beam (NOT sweep) (over 1000V 100W) ·BeamPower

8891

High-power beam tube designed for RF transmitter amplification, providing substantial output and rugged power handling in professional communications applications.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B9A
Base pins
-
Nominal heater
9.5 V / 153 A

Description

The 8891 is a high-power beam-power RF/television tube. The supplied datasheet provides heater or filament data, maximum ratings, operating conditions, RF output information, and interelectrode capacitances where applicable.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B9A
Base pins
-
Nominal heater voltage
9.5 V
Nominal heater current
153 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
10000 V
Max screen voltage
2000 V
Max plate dissipation
15000 W
Max screen dissipation
450 W
Max cathode current
6 A

Published ratings, characteristics, and operating data promoted from supplied datasheet.

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 RCA HB3 Binder 6 of 7

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • Maximum DC Plate Voltage

    10000 V

    Linear RF service up to 400 MHz

  • Maximum DC Screen Voltage

    2000 V

  • Maximum DC Control-Grid Voltage

    -600 V

    Television service

  • Maximum DC Plate Current

    6 A

  • Maximum Screen Input

    450 W

  • Maximum Control-Grid Input

    250 W

  • Maximum Plate Dissipation

    15 kW

    Linear RF service

  • TV Plate Voltage

    6580 V

    Cathode-drive circuit at 216 MHz

  • TV Screen Voltage

    1000 V

    Cathode-drive circuit at 216 MHz

  • TV Synchronizing-Level Plate Current

    4.82 A

    Cathode-drive circuit at 216 MHz

  • TV Blanking-Level Plate Current

    3.68 A

    Cathode-drive circuit at 216 MHz

  • TV Synchronizing-Level Driver Power

    865 W

    Cathode-drive circuit at 216 MHz

  • TV Synchronizing-Level Useful Power Output

    18.8 kW

    Cathode-drive circuit at 216 MHz

  • TV Blanking-Level Useful Power Output

    10.6 kW

    Cathode-drive circuit at 216 MHz

  • Typical Plate Voltage

    8000 V

    Cathode drive at 400 MHz

  • Typical Screen Voltage

    1500 V

    Cathode drive at 400 MHz

  • Typical Plate Current

    2.47 A

    Cathode drive at 400 MHz

  • Typical Driver Power

    500 W

    Cathode drive at 400 MHz

  • Typical Useful Power Output

    5000 W

    Cathode drive at 400 MHz

Characteristics

  • Mu Factor, Screen to Control Grid

    12.5

  • Grid-No.1 to Plate Capacitance

    0.4 pF

  • Grid-No.1 to Filament Capacitance

    100 pF

  • Plate to Filament Capacitance

    0.15 pF

  • Grid-No.1 to Screen Capacitance

    85 pF

  • Screen to Plate Capacitance

    20 pF

  • Screen to Filament Capacitance

    4 pF

  • Minimum Heating Time

    15 s