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QB35750GA

GA version of the QB3.5/150 transmitting tetrode for RF amplifier and oscillator service, providing substantial radio-frequency power.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 5 V / 14.1 A

Description

GA version of QB3.5/150 transmitting tetrode for RF amplifier and oscillator service.

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: 5 V
Nominal heater current: 14.1 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: 0.004 S
Amplification factor: 5.1
Max plate voltage: 4000 V
Max screen voltage: 600 V

Promoted where the locked schema directly matches published RF values; frequency/service-specific limits and operating conditions are retained as parameter rows.

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 Philips Electron Tubes Handbook V4

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

Maximum plate voltage
4000 V
RFPowerTube
Maximum screen voltage
600 V
RFPowerTube
Application
GA version of QB3.5/150 transmitting tetrode for RF amplifier and oscillator service.
SourceDescription
Service category
RF/AF power service as specified in source
RFPowerTube
Heater/filament voltage
5 V
RFPowerTube
Heater/filament current
14.1 A
RFPowerTube
Operating frequency
75 MHz
RFPowerAmplifier
Plate voltage
4000 V
RFPowerAmplifier
Power output
1000 W
RFPowerAmplifier
Maximum frequency
120 MHz
RFPowerAmplifier
Electrical reference
QB3.5/150
SourceCrossReference

Construction

Heating method
Direct
RFPowerTube
Device class
Tetrode
RFPowerTube

Characteristic

Transconductance
4000 µS
RFPowerTube
Screen-to-control-grid amplification factor
5.1
RFPowerTube

Capacitance

Plate capacitance
4.5 pF
RFPowerTube
Control-grid capacitance
12.7 pF
RFPowerTube