501R

Power triode documented for amplifier or control service, with manufacturer operating data emphasizing useful power output rather than small-signal voltage amplification. Its available documentation does not justify a narrower specialized functional category.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

501R is listed in the supplied Amperex material as a forced-air-cooled low-voltage high-current RF triode. Published ratings and characteristics were captured from the supplied table.

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

Amplification factor: 17
Max plate voltage: 3500 V
Max plate dissipation: 1000 W

Forced-air-cooled low-voltage/high-current power triode with thoriated-tungsten filament for RF heating.

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

Triode

Other

Plate voltage
3500 V
RFAmplifierOrOscillator; ClassC; Telegraphy
Plate current
870 mA
RFAmplifierOrOscillator; ClassC; Telegraphy
RF output power
2175 W
RFAmplifierOrOscillator; ClassC; Telegraphy
Grid voltage
-250 V
RFAmplifierOrOscillator; ClassC; Telegraphy
Grid current
133 mA
RFAmplifierOrOscillator; ClassC; Telegraphy
Maximum frequency at full input rating
150 MHz

Capacitance

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

Data set 02

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Filament voltage
7.5 V
TransmittingService
Filament current
24 A
TransmittingService
Amplification factor
17
TransmittingService

Other

Maximum plate dissipation
1000 W
TransmittingService
Plate voltage
3500 V
TransmittingService
Plate current
870 mA
TransmittingService
Power output
2175 W
TransmittingService
Grid bias
-250 V
TransmittingService
Grid current
133 mA
TransmittingService
Maximum frequency
150 MHz
FullInputWatts