QBL53500

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: 6.3 V / 32.5 A

Description

Water-cooled high-power transmitting tetrode for HF amplification, modulation, and frequency multiplication.

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: 32.5 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: 0.019 S
Amplification factor: 8.5
Max plate voltage: 5500 V
Max screen voltage: 800 V
Max plate dissipation: 3000 W
Max screen dissipation: 100 W
Max cathode current: 1.1 A

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
5500 V
RFPowerTube
Maximum screen voltage
800 V
RFPowerTube
Application
Water-cooled high-power transmitting tetrode for HF amplification, modulation, and frequency multiplication.
SourceDescription
Service category
RF/AF power service as specified in source
RFPowerTube
Heater/filament voltage
6.3 V
RFPowerTube
Heater/filament current
32.5 A
RFPowerTube
Operating frequency
75 MHz
RFPowerAmplifier
Plate voltage
5000 V
RFPowerAmplifier
Screen voltage
800 V
RFPowerAmplifier
Plate current
1.1 A
RFPowerAmplifier
Power output
4100 W
RFPowerAmplifier
Maximum frequency
220 MHz
RFPowerAmplifier

Construction

Heating method
Direct
RFPowerTube
Device class
Tetrode
RFPowerTube

Characteristic

Transconductance
19000 µS
RFPowerTube
Screen-to-control-grid amplification factor
8.5
RFPowerTube

Capacitance

Plate capacitance
8.4 pF
RFPowerTube
Control-grid capacitance
23.5 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
6.3 V
Heater/filament current
32.5 A
Transconductance
19000 uS
Screen-grid amplification factor
8.5

Other

Maximum plate/anode voltage
5500 V
Maximum screen-grid voltage
800 V
Maximum plate/anode dissipation
3000 W
Maximum screen-grid dissipation
100 W
Operating plate voltage
5000 V
ClassC;Telegraphy;75MHz
RF output power
4100 W
ClassC;Telegraphy;75MHz
Operating plate voltage
4000 V
ClassC;Telegraphy;220MHz
RF output power
2900 W
ClassC;Telegraphy;220MHz
Maximum anode input power
5500 W
30MHz
Maximum grid-1 dissipation
30 W

Capacitance

Plate/anode capacitance
8.4 pF
Control-grid capacitance
23.5 pF
Plate-grid capacitance
0.35 pF