AX4125A4D21

Amperex transmitting power tetrode in the 4-125A/4D21 family, with published RF operating, output-power, dissipation, and frequency data.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 5 V / 6.5 A

Description

AX4125A4D21 is listed in the supplied Amperex power-tube table as a transmitting power tetrode, with published filament, dissipation, operating, output-power, and frequency data.

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: 5 V
Nominal heater current: 6.5 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

Tetrode

X-ray radiationInterelectrode capacitances

Amplification factor: 6.2
Max plate voltage: 2500 V
Max screen voltage: 350 V
Max plate dissipation: 125 W

Published filament, dissipation, typical plate/grid/screen operation, output power, and maximum-frequency data reviewed.

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

1958 Amperex Industrial

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristic

Filament voltage
5 V
Published transmitting-tube rating
Filament current
6.5 A
Published transmitting-tube rating
Amplification factor
6.2
Published power-tube table

Other

Maximum plate dissipation
125 W
Published power-tube table
Plate voltage
2500 V
TransmittingService
Plate current
200 mA
TransmittingService
Power output
375 W
TransmittingService
Grid bias
-150 V
TransmittingService
Grid current
10 mA
TransmittingService
Screen voltage
350 V
TransmittingService
Maximum frequency
120 MHz
FullInputWatts