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

8757

Rugged ceramic-metal planar microwave triode for advanced airborne and space applications. Designed for CW and pulsed operation into the gigahertz region, it can produce roughly 3 kW useful grid-pulsed output at 3.5 GHz.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
6.3 V / 1.3 A

Description

The Eimac 8757 is a miniature frequency-stable rugged ceramic-metal planar triode for advanced airborne and space applications up to 3.5 GHz.

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
6.3 V
Nominal heater current
1.3 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
Transconductance
0.038 S
Amplification factor
75
Max plate voltage
3500 V
Max plate dissipation
150 W
Max grid dissipation
1.5 W

Promoted values are taken from printed General Characteristics / Maximum Ratings. Additional published conditions and operating data are preserved in 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 Eimac

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

  • Grid-Cathode Capacitance

    9 pF

  • Plate-Cathode Capacitance

    0.06 pF

  • Grid-Plate Capacitance

    1.65 pF

Characteristic

  • Cutoff Bias Maximum

    -30 V

    Ip=1mA; Ep=1kV

Other

  • Frequency CW Maximum

    3 GHz

  • Frequency Pulsed Maximum

    3.5 GHz

  • Peak Pulse Plate Voltage

    3500 V

  • Pulse Plate Current

    5 A

  • Useful Power Output

    3000 W

    GridPulsed;Frequency=3.5GHz