508

Very-high-power directly heated transmitting triode with a massive filament for professional RF power service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 30 V / 80 A

Description

508 is a Triode device in the supplied Amperex literature. Water-cooled very-high-power triode for RF heating oscillators and RF amplifiers in AM transmitters. 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: 30 V
Nominal heater current: 80 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: 28
Max plate voltage: 15000 V
Max plate dissipation: 25000 W

Water-cooled very-high-power triode for RF heating oscillators and RF amplifiers in AM transmitters.

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
15000 V
RFAmplifierOrOscillator; ClassC; Telegraphy
Plate current
3.75 A
RFAmplifierOrOscillator; ClassC; Telegraphy
RF output power
40000 W
RFAmplifierOrOscillator; ClassC; Telegraphy
Grid voltage
-900 V
RFAmplifierOrOscillator; ClassC; Telegraphy
Grid current
420 mA
RFAmplifierOrOscillator; ClassC; Telegraphy
Maximum frequency at full input rating
40 MHz

Capacitance

Grid-to-plate capacitance
17 pF
Grid-to-filament/cathode capacitance
26 pF
Plate-to-filament/cathode capacitance
2.5 pF