QV2250B

Forced-air-cooled UHF power tetrode designed for operation to approximately 500 MHz. Its professional construction supports substantial radio-frequency output.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6 V / 2.6 A

Description

The Mullard QV2250B is a forced-air-cooled UHF power tetrode for operation to 500 MHz.

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: 6 V
Nominal heater current: 2.6 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: 0.012 S
Max plate voltage: 2000 V
Max screen voltage: 300 V
Max plate dissipation: 250 W

Forced-air-cooled UHF power tetrode for operation to 500 MHz.

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
6 V
Heater/Filament Current
2.6 A
Transconductance
12000 uS
RepresentativeSpecifiedOperatingPoint
Grid-Cathode Capacitance
15.7 pF
Plate-Cathode Capacitance
4.5 pF

Other

Maximum Operating Frequency
500 MHz
FullOrSpecifiedRatings
Maximum Plate Voltage
2000 V
Maximum Screen Voltage
300 V
Maximum Plate Dissipation
250 W
Plate-Grid Capacitance Maximum
0.06 pF
RF Output Power
390 W
RepresentativePublishedOperatingPoint
RF Output Power
225 W
RepresentativePublishedOperatingPoint
Plate Voltage
2000 V
ClassC; Telegraphy; 175MHz
Plate Current
250 mA
ClassC; 175MHz
RF Output Power
390 W
ClassC; 175MHz
Plate Voltage
2000 V
ClassC; Telegraphy; 500MHz
RF Output Power
225 W
ClassC; 500MHz