Z21

Two-volt high-frequency pentode explicitly specified for radio detector, LF-amplifier, oscillator, and HF-amplifier service. Its detector role is sufficiently central to retain the radio detector/converter umbrella.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 2 V / -

Description

Two-volt HF pentode for detector, LF-amplifier, oscillator, and HF-amplifier service.

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: 2 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

Max plate voltage: 150 V
Max screen voltage: 90 V

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
2 V

Other

Maximum/Published Anode Voltage
150 V
Maximum/Published Screen Voltage
90 V

Capacitance

Grid-Anode Capacitance
0.005 pF
Input Capacitance
10 pF
Output Capacitance
6.5 pF