450TH

Directly heated transmitting power triode intended for RF amplifier, oscillator, or modulator service. Manufacturer operating data emphasize radio-frequency power generation, substantial plate loading, and professional transmitter applications.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: SPECIAL4
Base pins: -
Nominal heater: 7.5 V / 12 A

Description

450TH is a Triode device in the supplied Amperex literature. Radiation-cooled high-power triode widely used in AM broadcasting, government transmitters, and RF heating. Published ratings, operating points, capacitances, pulse data, or industrial service limits were preserved in the technical output as applicable.

Socket description

Special 4-contact transmitting-tube base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: SPECIAL4
Base pins: -
Nominal heater voltage: 7.5 V
Nominal heater current: 12 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: 0.00665 S
Amplification factor: 38
Max plate voltage: 6000 V
Max plate dissipation: 450 W
Max grid dissipation: 65 W

Radiation-cooled high-power triode widely used in AM broadcasting, government transmitters, and 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
5000 V
RFAmplifierOrOscillator; ClassC; Telegraphy
Plate current
450 mA
RFAmplifierOrOscillator; ClassC; Telegraphy
RF output power
1800 W
RFAmplifierOrOscillator; ClassC; Telegraphy
Grid voltage
-300 V
RFAmplifierOrOscillator; ClassC; Telegraphy
Grid current
90 mA
RFAmplifierOrOscillator; ClassC; Telegraphy
Maximum frequency at full input rating
40 MHz

Capacitance

Grid-to-plate capacitance
5 pF
Grid-to-filament/cathode capacitance
8.8 pF
Plate-to-filament/cathode capacitance
0.8 pF

Data set 02

1962 Eimac

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Frequency for Maximum Ratings
40 MHz

Other

Maximum DC Plate Current
600 mA
Published maximum
Typical Plate Output Power
2200 W
Class-B, two tubes, 5000 V plate

Capacitance

Grid-Plate Capacitance
5 pF
Average
Grid-Filament Capacitance
8.8 pF
Average
Plate-Filament Capacitance
0.8 pF
Average