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Specialized - Switching Tube ·Tetrode

QV20P18

RF power tetrode for professional transmitting service. Its substantial heater power and electrode construction support high radio-frequency output.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 26 V / 2.25 A

Description

The Mullard QV20P18 is a high-voltage tetrode pulse modulator rated for 20 kV and 18 A.

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: 26 V
Nominal heater current: 2.25 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

Max plate voltage: 20000 V
Max screen voltage: 1500 V
Max plate dissipation: 60 W

High-voltage tetrode pulse modulator rated for 20 kV and 18 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 Mullard

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristics

Heater/Filament Voltage
26 V
Heater/Filament Current
2.25 A
Input Capacitance
43 pF
Output Capacitance
9 pF
Plate-Grid Capacitance
0.3 pF
Pulse Duration
2 us
Pulse Repetition Frequency
500 Hz

Other

Maximum Plate Voltage
20000 V
Maximum Screen Voltage
1500 V
Maximum Plate Dissipation
60 W
Maximum Pulse Plate Voltage
25000 V
Maximum Pulse Plate Current
18 A
Pulse Output Power
305 kW
RepresentativePublishedOperatingPoint
Plate Voltage
20000 V
PulseModulator
Pulse Plate Current
16 A
PulseModulator
Pulse Input Power
320 kW
PulseModulator
Pulse Output Power
305 kW
PulseModulator