YL1490

Exceptionally high-power coaxial metal-ceramic transmitting tetrode incorporating a vapor-cooling boiler. Intended for transmitter and audio-frequency modulator duty, it combines extremely high transconductance with approximately 200 kW plate dissipation for very large installations.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 7.2 V / 1025 A

Description

Very-high-power coaxial metal-ceramic vapor-cooled tetrode with integrated boiler for transmitter and AF modulator service.

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: 7.2 V
Nominal heater current: 1025 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

Transconductance: 0.2 S
Amplification factor: 4.3
Max plate voltage: 15000 V
Max screen voltage: 2200 V
Max plate dissipation: 200000 W
Max screen dissipation: 6600 W
Max grid dissipation: 1400 W
Max cathode current: 50 A

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

1963 Siemens

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristic

EmissionCurrent
380 A
UA = UG2 = UG1 = 700 V

Other

CarrierPower
270 kW
Class C; <=30 MHz
Typical Plate Voltage
12.5 kV
Class C
Typical Screen Voltage
1200 V
Class C
Typical Plate Current
28 A
Class C
Efficiency
77 percent
Class C
AFOutputPower
350 kW
Class B; two tubes push-pull