C180

Marconi twin tetrode designed for push-pull VHF power-amplifier service. Two physical tetrode sections share one envelope for balanced radio-frequency output operation.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: -
Base pins: -
Nominal heater: 12.6 V / 800 mA

Description

Twin tetrode for push-pull VHF power-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: 12.6 V
Nominal heater current: 800 mA
Parallel heater voltage: 6.3 V
Parallel heater current: 1.6 A
Series capable: Yes

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

Tetrode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0035 S
Max plate voltage: 750 V
Max screen voltage: 250 V
Max plate dissipation: 20 W

Section 2

Tetrode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0035 S
Max plate voltage: 750 V
Max screen voltage: 250 V
Max plate dissipation: 20 W

Second identical physical tetrode 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

Tetrode

Characteristic

Heater Voltage Series
12.6 V
Both sections
Heater Current Series
800 mA
Both sections
Heater Voltage Parallel
6.3 V
Both sections
Heater Current Parallel
1.6 A
Both sections
Transconductance
3500 uS
Per section

Other

Maximum Anode Voltage
750 V
Per section
Maximum Screen Voltage
250 V
Per section
Maximum Anode Dissipation
20 W
Per section
Maximum Frequency
250 MHz

Capacitance

Grid-Anode Capacitance
0.07 pF
Per section
Input Capacitance
8 pF
Output Capacitance
3.8 pF
Screen Bypass Capacitance
65 pF