PC033A

PC03/3A directly heated transmitting pentode variant using a 2 V oxide filament. Designed for RF power amplification and related transmitter service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 2 V / 240 mA

Description

PC03/3A transmitting pentode variant with 2 V oxide filament. The supplied Philips source was read for heater/filament data, ratings, characteristics, RF/television operating conditions, and capacitances where published.

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: 2 V
Nominal heater current: 240 mA
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

Pentode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0014 S
Max plate voltage: 300 V
Max screen voltage: 300 V
Max plate dissipation: 3 W
Max screen dissipation: 1.5 W
Max cathode current: 25 mA

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

Pentode

Other

Maximum plate voltage
300 V
Maximum screen voltage
300 V
Maximum plate dissipation
3 W
Maximum screen dissipation
1.5 W
Maximum cathode current
25 mA
Operating plate voltage
300 V
ClassC;Telegraphy;NoGridCurrent
Operating screen voltage
125 V
ClassC;Telegraphy;NoGridCurrent
Operating plate current
25 mA
ClassC;Telegraphy;NoGridCurrent
RF output power
3 W
ClassC;Telegraphy;NoGridCurrent
Efficiency
52.5 %
ClassC;Telegraphy;NoGridCurrent

Characteristics

Transconductance
1400 uS
Screen-grid amplification factor
3.3

Capacitance

Plate-cathode capacitance
11 pF
Grid-cathode capacitance
8.5 pF
Plate-grid capacitance
0.2 pF