8877

Rugged high-mu ceramic-metal transmitting triode for cathode-driven audio and RF amplification, including VHF service. Rated for 1.6 kW plate dissipation, with published 88–108 MHz Class B operation producing roughly 2.6 kW.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: SK2200
Base pins: 7
Nominal heater: 5 V / 10.5 A

Description

The Eimac 8877/3CX1500A7 is a rugged ceramic-metal high-mu power triode for cathode-driven class-AB2 or class-B audio and RF amplification, including VHF and plate-modulated class-C service.

Socket description

Eimac SK-2200 special 7-contact air-system socket family

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: SK2200
Base pins: 7
Nominal heater voltage: 5 V
Nominal heater current: 10.5 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: 0.055 S
Amplification factor: 200
Max plate voltage: 4000 V
Max plate dissipation: 1600 W
Max grid dissipation: 25 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
38.5 pF
CathodeGrounded
Output Capacitance
0.1 pF
CathodeGrounded
Grid-Plate Capacitance
10 pF
CathodeGrounded

Other

Frequency Maximum
250 MHz
CW
Maximum DC Plate Current
1 A
ClassAB2
Typical Useful Output Power
2600 W
ClassB;Frequency=88-108MHz