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Power - Beam (NOT sweep) ·BeamPower

7801

High-frequency beam-power transmitting tube producing useful output into the microwave region, including about 27 W at 400 MHz and 15 W at 1.2 GHz.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B9A
Base pins
9
Nominal heater
12.6 V / 500 mA

Description

The 7801 is a beam-power transmitting tube. The supplied datasheet was processed for heater or filament data, maximum ratings, operating characteristics, capacitances where published, and service-specific power or frequency data.

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
9
Nominal heater voltage
12.6 V
Nominal heater current
500 mA
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
Transconductance
0.0075 S
Max plate voltage
750 V
Max screen voltage
250 V
Max cathode current
70 mA

Published ratings/characteristics 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

    750 V

    7801 electrical data

  • Maximum DC Screen Voltage

    250 V

    7801 electrical data

  • Maximum DC Plate Current

    70 mA

    7801 electrical data

  • Maximum Plate Input

    52.5 W

    7801 electrical data

  • Maximum Screen Input

    2 W

    7801 electrical data

  • Typical DC Plate Voltage

    650 V

    7801 electrical data

  • Typical DC Screen Voltage

    225 V

    7801 electrical data

  • Power Output at 400 MHz

    27 W

    7801 electrical data

  • Power Output at 1200 MHz

    15 W

    7801 electrical data

  • Power Output at 3000 MHz

    3.2 W

    7801 electrical data

Characteristics

  • Transconductance

    7500 µS

    7801 electrical data

  • Mu Factor, Screen to Control Grid

    30

    7801 electrical data

  • Grid-No.1 to Plate Capacitance

    0.025 pF

    7801 electrical data