ACT25

Forced-air-cooled disc-seal transmitting triode for wideband UHF amplifier and oscillator service to approximately 1 GHz.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 13.5 V / 2.8 A

Description

The ACT25 is a forced-air-cooled disc-seal transmitting triode for wide-band UHF amplifier and oscillator service in coaxial-line or cavity circuits up to about 1 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: 13.5 V
Nominal heater current: 2.8 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: 0.035 S
Max plate voltage: 1000 V
Max plate dissipation: 400 W

Published maximum ratings and characteristics audited; remaining useful numerical data retained in TUBE_SECTION_PARAMETER.

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

1955 Marconi

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

at a pressure equal to a
2
at a pressure equal to a 2}-in. head of water. The grid
air necessary is about
5
air necessary is about 5 cu. ft. per minute. All cooling
any supply voltages, and must continue until after all [1]
2.73 V
any supply voltages, and must continue until after all 2.73' | 225
any supply voltages, and must continue until after all [2]
225 V
any supply voltages, and must continue until after all 2.73' | 225
u
75
u 75 CATHODE.