BR195

High-power forced-air-cooled Marconi transmitting triode for VHF RF service. Approximately 4 kW plate dissipation and 5 kV plate capability support substantial transmitter power with full ratings extending to roughly 220 MHz.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6 V / 67 A

Description

Forced-air-cooled transmitting triode for 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: 6 V
Nominal heater current: 67 A
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

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.018 S
Amplification factor: 22
Max plate voltage: 5000 V
Max plate dissipation: 4000 W
Max grid dissipation: 250 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

Triode

Characteristic

Filament Voltage
6 V
Filament Current
67 A
Amplification Factor
22
Transconductance
18000 uS

Other

Maximum Anode Voltage
5000 V
Maximum Anode Dissipation
4000 W
Maximum Grid Dissipation
250 W
Frequency at Full Ratings
220 MHz

Capacitance

Anode-Grid Capacitance
16.5 pF
Anode-Cathode Capacitance
0.5 pF
Grid-Cathode Capacitance
26.5 pF

Construction

Cooling
Forced air