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Power - Beam (NOT sweep) ·BeamPower

QQV0640A

Double beam tetrode designed for push-pull RF amplification and oscillation to approximately 500 MHz, capable of substantial Class-C output.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 12.6 V / 900 mA

Description

The Mullard QQV0640A is a beam-power double tetrode for push-pull RF amplification/oscillation 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: 12.6 V
Nominal heater current: 900 mA
Parallel heater voltage: 6.3 V
Parallel heater current: 1.8 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: 0.0045 S
Amplification factor: 8
Max screen voltage: 300 V
Max plate dissipation: 20 W
Max screen dissipation: 3.5 W
Max grid dissipation: 1 W

Representative of two identical RF-power sections.

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 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
Plate-Grid Capacitance
0.06 pF
EachSection
Grid-Anode Capacitance
10.5 pF
EachSection
Plate-to-Other-Anode Capacitance
3.2 pF
EachSection
Push-Pull Output Capacitance
21 pF
TwoSections; PushPull
Push-Pull Input Capacitance
6.7 pF
TwoSections; PushPull
Transconductance
4500 uS
EachSection; Ia=30mA

Other

Maximum Plate Dissipation
20 W
EachSection
Maximum Operating Frequency
500 MHz
RF Output Power
90 W
ClassC; PushPull; RepresentativeHighOutput