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Power - Beam (NOT sweep) ·BeamPower

QQV0740

Twin beam tetrode designed for Class-C RF amplifier and oscillator service to approximately 250 MHz.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
12.6 V / 2.5 A

Description

The Mullard QQV0740 is a twin beam tetrode for Class C RF amplifier or oscillator service to 250 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
12.6 V
Nominal heater current
2.5 A
Parallel heater voltage
6.3 V
Parallel heater current
2.5 A
Series capable
Yes

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
0.0085 S
Max plate voltage
750 V
Max plate dissipation
20 W

Published ratings and characteristics promoted semantically from the approved source; repeated identical physical sections compressed where applicable.

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

1951 Mullard Valve and Service Manual

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • Operating Frequency Maximum

    250 MHz

  • Plate Voltage

    750 V

    PushPull,ClassC

  • Power Output

    24 W

    GridModulated,PushPull

Data set 02

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Characteristics

  • Heater Voltage

    6.3 V

  • Heater Current

    1.8 A

  • Heater Voltage Series

    12.6 V

  • Heater Current Series

    900 mA

  • Heater Voltage Parallel

    6.3 V

  • Heater Current Parallel

    1.8 A

Other

  • Maximum Plate Dissipation

    20 W

    EachSection

  • Maximum Operating Frequency

    250 MHz

  • RF Output Power

    70 W

    ClassC; PushPull; Representative

  • RF Output Power

    63 W

    ClassC; PushPull; AlternateOperatingPoint