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Power - TV Vertical Output ·Pentode

N329

High-slope Marconi power pentode for both audio output and television frame time-base service.

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

Description

The Marconi N329 is a high-slope pentode for audio and frame 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
16.5 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
Plate resistance
20000 Ω
Transconductance
0.009 S
Max plate voltage
250 V
Max screen voltage
250 V
Max plate dissipation
9 W
Max screen dissipation
2.5 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

    16.5 V

  • Heater current

    300 mA

  • Maximum plate voltage

    250 V

  • Maximum screen voltage

    250 V

  • Maximum plate dissipation

    9 W

  • Maximum screen dissipation

    2.5 W

  • Peak pulse plate voltage

    2500 V

    Pulse

Characteristic

  • Transconductance

    9000 uS

  • Plate resistance

    20000 ohm

Application

  • Primary application

    High-slope pentode for audio and frame time-base output service.