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Power - Beam (NOT sweep) (over 1000V 100W) ·BeamPower

QY4400

Forced-air-cooled beam-power tetrode designed for RF power amplification, oscillator, single-sideband linear, and modulator service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 5 V / 14.5 A

Description

The Mullard QY4400 is a forced-air-cooled beam-power tetrode for RF power, oscillator, SSB linear, or 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: 5 V
Nominal heater current: 14.5 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

Beam Power

X-ray radiationInterelectrode capacitances

Transconductance: 0.004 S
Max plate voltage: 4000 V
Max screen voltage: 600 V
Max plate dissipation: 400 W

Forced-air-cooled beam-power tetrode for RF power, oscillator, SSB linear, or modulator service.

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 Mullard

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Characteristics

Heater/Filament Voltage
5 V
Heater/Filament Current
14.5 A
Transconductance
4000 uS
RepresentativeSpecifiedOperatingPoint
Input Capacitance
12.7 pF
Output Capacitance
4.9 pF
Plate-Grid Capacitance
0.12 pF

Other

Maximum Operating Frequency
110 MHz
FullOrSpecifiedRatings
Maximum Plate Voltage
4000 V
Maximum Screen Voltage
600 V
Maximum Plate Dissipation
400 W
RF Output Power
1100 W
RepresentativePublishedOperatingPoint
PEP Output Power
650 W
RepresentativePublishedOperatingPoint
Push-Pull Audio Output Power
1540 W
RepresentativePublishedOperatingPoint
Plate Voltage
4000 V
ClassC; TelegraphyOrFMTelephony; f<75MHz
Plate Current
350 mA
ClassC
RF Output Power
1100 W
ClassC
Efficiency
79 percent
ClassC
Push-Pull Output Power
1540 W
ClassAB; AudioAmplifier; TwoTubes; Va=4kV