5681

Machlett coaxial-terminal high-power triode for broadband RF amplification and audio/modulator service. Approximately 15 kV plate capability and 75 kW plate dissipation place it among very large professional transmitting and industrial power tubes.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 12 V / 220 A

Description

The Machlett 5681 is a coaxial-terminal water/air-cooled high-power triode for broadband rf and audio/modulator 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: 12 V
Nominal heater current: 220 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

Amplification factor: 25
Max plate voltage: 15000 V
Max plate dissipation: 75000 W
Max cathode current: 18.6 A

Maximum ratings and general characteristics promoted from the printed service tables.

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 Machlette Laboratories

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Amplification factor
25

Other

Maximum DC plate voltage
15000 V
Maximum plate dissipation
75000 W
Maximum plate/cathode current
18.6 A