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QQV0640

Double RF power tetrode with approximately 20 W anode dissipation per section, designed for amplifier or oscillator service to about 300 MHz.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 2 A

Description

Double RF power tetrode with 20 W anode dissipation per section for amplifier or oscillator service to about 300 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: 6.3 V
Nominal heater current: 2 A
Parallel heater voltage: 6.3 V
Parallel heater current: 2 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

Tetrode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0045 S
Max plate voltage: 600 V
Max screen voltage: 250 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

Tetrode

Other

Operating Frequency Maximum
300 MHz
ReducedRatings
Power Output
85 W
PushPull,ClassC,60MHz
Power Output
40 W
PushPull,ClassC,300MHz