Z719

High-slope RF pentode designed with high radio-frequency input impedance. Marconi documentation identifies it for high-frequency signal amplification where reduced input loading is an important circuit requirement.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 300 mA

Description

High-slope RF pentode with high radio-frequency input impedance.

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: 6.3 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: 14000 Ω
Amplification factor: 50
Max plate voltage: 300 V
Max screen voltage: 300 V
Max plate dissipation: 2.5 W
Max screen dissipation: 0.7 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
Heater/Filament Current
300 mA
Amplification Factor
50
Plate Resistance
14000 ohm

Other

Maximum/Published Anode Voltage
300 V
Maximum/Published Screen Voltage
300 V
Maximum Anode Dissipation
2.5 W
Maximum Screen Dissipation
0.7 W

Capacitance

Grid-Anode Capacitance
0.006 pF
Input Capacitance
7.5 pF
Output Capacitance
3.3 pF