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QC0535

Quick-heating beam-power tetrode designed for RF amplification, oscillation, and frequency multiplication, suitable for rapid-start transmitting service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: OCTAL 8P
Socket code: IO
Base pins: 8
Nominal heater: 1.6 V / 3.2 A

Description

Quick-heating beam-power tetrode for RF amplifier, oscillator, and frequency-multiplier service.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: OCTAL 8P
Socket code: IO
Base pins: 8
Nominal heater voltage: 1.6 V
Nominal heater current: 3.2 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

OCTAL 8P - 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: 0.007 S
Amplification factor: 4.5
Max plate voltage: 650 V
Max screen voltage: 250 V
Max plate dissipation: 25 W
Max screen dissipation: 5 W
Max cathode current: 160 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

Beam Power

Other

Maximum plate voltage
650 V
RFPowerTube
Maximum screen voltage
250 V
RFPowerTube
Application
Quick-heating beam-power tetrode for RF amplifier, oscillator, and frequency-multiplier service.
SourceDescription
Service category
RF/AF power service as specified in source
RFPowerTube
Heater/filament voltage
1.6 V
RFPowerTube
Heater/filament current
3.2 A
RFPowerTube
Operating frequency
60 MHz
RFPowerAmplifier;IntermittentMobile
Plate voltage
600 V
RFPowerAmplifier;IntermittentMobile
Screen voltage
180 V
RFPowerAmplifier;IntermittentMobile
Control-grid voltage
-71 V
RFPowerAmplifier;IntermittentMobile
Plate current
150 mA
RFPowerAmplifier;IntermittentMobile
Power output
65 W
RFPowerAmplifier;IntermittentMobile
Operating frequency
175 MHz
RFPowerAmplifier;IntermittentMobile
Plate voltage
400 V
RFPowerAmplifier;IntermittentMobile;175MHz
Power output
35 W
RFPowerAmplifier;IntermittentMobile;175MHz

Construction

Heating method
Direct
RFPowerTube
Device class
BeamPower
RFPowerTube

Characteristic

Transconductance
7000 µS
RFPowerTube
Screen-to-control-grid amplification factor
4.5
RFPowerTube
Cathode heating time to >70% output
0.4 s
QuickHeating

Capacitance

Plate capacitance
8.5 pF
RFPowerTube
Control-grid capacitance
13.5 pF
RFPowerTube

Data set 02

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Characteristics

Heater/filament voltage
1.6 V
Heater/filament current
3.2 A
Transconductance
7000 uS
Screen-grid amplification factor
4.5
Cathode heating time to >70% output
0.4 sec

Other

Maximum plate/anode voltage
650 V
Maximum screen-grid voltage
250 V
Maximum plate/anode dissipation
25 W
Maximum screen-grid dissipation
5 W
Operating plate voltage
600 V
ClassC;Telegraphy;60MHz
RF output power
65 W
ClassC;Telegraphy;60MHz
Operating plate voltage
400 V
ClassC;Telegraphy;175MHz
RF output power
35 W
ClassC;Telegraphy;175MHz
Maximum anode input power
90 W
60MHz

Capacitance

Plate/anode capacitance
8.5 pF
Control-grid capacitance
15.5 pF
Plate-grid capacitance
0.24 pF