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

8875

Ceramic-metal RF power triode in the 8873/8874 family, rated for 300 W plate dissipation. It operates to approximately 500 MHz and provides roughly 587 W useful output under published Class AB2 conditions.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
E11-81
Socket code
E11
Base pins
11
Nominal heater
6.3 V / 3 A

Description

The Eimac 8875 is a compact external-anode ceramic-metal triode for class-AB or class-C radio-frequency amplifiers, with its own specified cooling arrangement and dissipation rating.

Socket description

Large-wafer Elevenar 11-pin with ring

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
E11-81
Socket code
E11
Base pins
11
Nominal heater voltage
6.3 V
Nominal heater current
3 A
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

E11-81 - 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
0.029 S
Max plate voltage
2200 V
Max plate dissipation
300 W
Max grid dissipation
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

  • Input Capacitance

    20.5 pF

    CathodeGrounded

  • Output Capacitance

    0.03 pF

    CathodeGrounded

  • Grid-Plate Capacitance

    6 pF

    CathodeGrounded

Other

  • Frequency Maximum

    500 MHz

  • Maximum DC Plate Current

    350 mA

  • Typical Plate Voltage

    2000 V

    ClassAB2

  • Typical Useful Output Power

    587 W

    ClassAB2;Frequency=30MHz