5761

Forced-air-cooled version of the Amperex 502 high-current transmitting triode. Intended for VHF RF amplifier and oscillator service, it produces roughly 2.18 kW Class C output with full-input operation to about 150 MHz.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 7.5 V / 24 A

Description

5761 is a Triode device in the supplied Amperex literature. Co-designation of 502R; forced-air-cooled version of the Amperex 502 power triode. Published ratings, operating points, capacitances, pulse data, or industrial service limits were preserved in the technical output as applicable.

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: 7.5 V
Nominal heater current: 24 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: 0.01 S
Amplification factor: 17
Max plate voltage: 3500 V
Max plate dissipation: 1500 W

Published ratings and characteristics mapped semantically from the source.

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

1953 Amperex

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Amplification factor
17
Published source value

Construction

Cooling method
forced air
Published source value

Data set 02

1958 Amperex Industrial

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
3500 V
RFAmplifierOrOscillator; ClassC; Telegraphy
Plate current
860 mA
RFAmplifierOrOscillator; ClassC; Telegraphy
RF output power
2175 W
RFAmplifierOrOscillator; ClassC; Telegraphy
Grid voltage
-450 V
RFAmplifierOrOscillator; ClassC; Telegraphy
Grid current
150 mA
RFAmplifierOrOscillator; ClassC; Telegraphy
Maximum frequency at full input rating
150 MHz

Capacitance

Grid-to-plate capacitance
10 pF
Grid-to-filament/cathode capacitance
14 pF
Plate-to-filament/cathode capacitance
1.3 pF