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QYS50P40

Very-high-power directly heated RF tetrode with a massive filament. It is intended for major transmitting installations requiring substantial radio-frequency output.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 11.5 V / 64 A

Description

The Mullard QYS50P40 is a silica-envelope tetrode pulse modulator rated for 50 kV and 40 A; substantial X-radiation hazard.

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: 11.5 V
Nominal heater current: 64 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: 0.038 S
Max plate voltage: 50000 V
Max screen voltage: 5000 V
Max plate dissipation: 5000 W

Silica-envelope tetrode pulse modulator rated for 50 kV and 40 A; substantial X-radiation hazard.

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

Tetrode

Characteristics

Filament Voltage
11.5 V
Filament Current
64 A
Plate-Grid Capacitance
3 pF
Grid-to-All-Other-Electrodes Capacitance
45 pF
Transconductance
38000 uS
Va=10kV; Ia=30A

Other

Maximum Filament Surge Current
100 A
Warmup
Maximum Plate Voltage
50000 V
PulseModulator
Maximum Pulse Current
40 A
PulseModulator