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Voltage - Dual Triode (similar high frequency) ·Triode-Triode

B319

Marconi RF double triode with separate cathodes designed for cascode amplification to approximately 250 MHz, suited to sensitive VHF receiver front ends.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
-
Socket code
B9A
Base pins
9
Nominal heater
7.4 V / 300 mA

Description

The Marconi B319 is a rf double triode with separate cathodes for cascode amplification to about 250 mhz.

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
7.4 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

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
4000 Ω
Transconductance
0.006 S
Amplification factor
24
Max plate voltage
250 V
Max plate dissipation
2 W

Representative section for two equal triode systems.

Section 2

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
4000 Ω
Transconductance
0.006 S
Amplification factor
24
Max plate voltage
250 V
Max plate dissipation
2 W

Second physical triode section; added to align rows with SectionCount.

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

Triode

Other

  • Heater voltage

    7.4 V

  • Heater current

    300 mA

  • Maximum plate voltage

    250 V

  • Maximum plate dissipation per section

    2 W

  • Cascode RF frequency limit

    250 MHz

Characteristic

  • Amplification factor

    24

  • Transconductance

    6000 uS

  • Plate resistance

    4000 ohm

Capacitance

  • Grid-plate capacitance

    1.1 pF

  • Grid-cathode capacitance

    2.3 pF

  • Plate-cathode capacitance

    0.17 pF