8847

Miniature rugged ceramic-metal planar triode for airborne and space CW or pulsed amplifier, oscillator, and frequency-multiplier service to approximately 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 8847 is a miniature rugged ceramic-metal planar triode for advanced airborne and space applications up to 3.5 GHz, suitable for CW and pulsed amplifier, oscillator, and frequency-multiplier 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: 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: 4000 V
Max plate dissipation: 150 W
Max grid dissipation: 1.5 W
Max cathode current: 7.5 A

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
9.5 pF
Plate-Cathode Capacitance
0.06 pF
Grid-Plate Capacitance
1.4 pF

Characteristic

Cutoff Bias Maximum
-30 V

Other

Frequency CW Maximum
3 GHz
Peak Pulse Plate Voltage
4000 V
Pulse Plate Current
5 A