Z319

Secondary-emitter high-slope pentode designed for wide-band RF amplification. Marconi documentation identifies its specialized secondary-emission construction as a means of obtaining substantial gain and bandwidth in high-frequency circuits.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / -

Description

Secondary-emitter high-slope pentode for wide-band RF amplification.

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: 6.3 V
Nominal heater current: -
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: 50000 Ω
Transconductance: 0.019 S
Max plate voltage: 350 V
Max screen voltage: 250 V
Max plate dissipation: 2.5 W
Max screen dissipation: 0.8 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

Characteristic

Heater/Filament Voltage
6.3 V
Transconductance
19000 uS
Plate Resistance
50000 ohm
Equivalent noise resistance
5000 ohm

Other

Maximum/Published Anode Voltage
350 V
Maximum/Published Screen Voltage
250 V
Maximum Anode Dissipation
2.5 W
Maximum Screen Dissipation
0.8 W

Capacitance

Grid-Anode Capacitance
0.003 pF
Input Capacitance
8 pF
Output Capacitance
3 pF