QB3300

Transmitting power tetrode designed for RF amplification, linear/SSB service, oscillation, modulation, broadcasting, or frequency multiplication.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 5 V / 6.5 A

Description

Radiation-cooled transmitting tetrode for RF or LF amplifier 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: 6.5 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: 0.0022 S
Amplification factor: 6.2
Max plate voltage: 3000 V
Max screen voltage: 400 V
Max plate dissipation: 560 W
Max cathode current: 350 mA

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
3000 V
RFPowerTube
Maximum screen voltage
400 V
RFPowerTube
Application
Radiation-cooled transmitting tetrode for RF or LF amplifier service.
SourceDescription
Service category
RF/AF power service as specified in source
RFPowerTube
Heater/filament voltage
5 V
RFPowerTube

Construction

Heating method
Direct
RFPowerTube
Device class
Tetrode
RFPowerTube

Characteristic

Transconductance
2200 µS
RFPowerTube
Screen-to-control-grid amplification factor
6.2
RFPowerTube

Capacitance

Plate capacitance
3.5 pF
RFPowerTube
Control-grid capacitance
10.8 pF
RFPowerTube

Data set 02

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristics

Heater/filament voltage
5 V
Heater/filament current
6.5 A
Transconductance
2200 uS
Screen-grid amplification factor
6.2
Typical screen-grid amplification factor
6.2
Typical transconductance at 40 mA
2200 uS

Other

Maximum plate/anode voltage
3000 V
Maximum screen-grid voltage
600 V
Maximum plate/anode dissipation
560 W
Operating plate voltage
3000 V
ClassC;Telegraphy;120MHz
RF output power
375 W
ClassC;Telegraphy;120MHz
Operating plate voltage
2500 V
ClassC;Telegraphy;120MHz
RF output power
375 W
ClassC;Telegraphy;120MHz

Capacitance

Plate/anode capacitance
3.5 pF
Control-grid capacitance
10.8 pF
Plate-grid capacitance
0.05 pF