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QC0515

Directly heated screen-grid transmitting tetrode designed for short-wave RF amplification. Philips documentation provides filament data, capacitances, limiting ratings, and representative RF operating conditions.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 4 V / 1.1 A

Description

Directly heated screen-grid transmitting tetrode for short-wave RF amplification. The supplied Philips source was read for heater or filament data, capacitances, limiting ratings, and representative RF/television operating conditions, with variant-sheet cross-references preserved.

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: 4 V
Nominal heater current: 1.1 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: 0.0015 S
Amplification factor: 3
Max plate voltage: 500 V
Max screen voltage: 125 V
Max plate dissipation: 15 W
Max screen dissipation: 6 W
Max cathode current: 75 mA

Published transmitting-tube ratings and principal characteristics promoted; additional RF operating points retained as parameters.

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

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristics

Heater/filament voltage
4 V
Heater/filament current
1.1 A
Transconductance
1500 uS
Screen-grid amplification factor
3
Maximum transconductance
2500 uS

Other

Maximum plate/anode voltage
500 V
Maximum screen-grid voltage
125 V
Maximum plate/anode dissipation
15 W
Maximum screen-grid dissipation
6 W
Operating plate voltage
500 V
ClassC;Telegraphy;15m
RF output power
15 W
ClassC;Telegraphy;15m
Operating plate voltage
500 V
ClassC;PlateModulation;15m
RF output power
8.5 W
ClassC;PlateModulation;15m
Maximum screen-grid dissipation
6 W

Capacitance

Plate/anode capacitance
14.5 pF
Control-grid capacitance
13.7 pF
Plate-grid capacitance
0.004 pF