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Power - TV Horizontal Output (sweep) ·Pentode

N339

Power pentode designed for television line time-base output service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B9A
Base pins
9
Nominal heater
20 V / 300 mA

Description

The Marconi N339 is a power pentode for television line time-base output service.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B9A
Base pins
9
Nominal heater voltage
20 V
Nominal heater current
300 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
Max plate voltage
300 V
Max screen voltage
200 V
Max plate dissipation
12 W
Max screen dissipation
4.5 W

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

1955 Marconi

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater voltage

    20 V

  • Heater current

    300 mA

  • Maximum plate voltage

    300 V

  • Maximum screen voltage

    200 V

  • Maximum plate dissipation

    12 W

  • Maximum screen dissipation

    4.5 W

  • Peak pulse plate voltage

    7500 V

    Pulse

Application

  • Primary application

    Power pentode for television line time-base output service.