BR189

High-power forced-air-cooled RF transmitting triode arranged for cathode-driven operation. Its 27 kW plate dissipation and 12 kV rating support major grounded-grid communications and broadcast power stages.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 9 V / 240 A

Description

R.f. transmitting triode with grid terminals suitable for cathode-drive operation.

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: 9 V
Nominal heater current: 240 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: 0.0275 S
Amplification factor: 34
Max plate voltage: 12000 V
Max plate dissipation: 27000 W
Max grid dissipation: 1250 W
Max cathode current: 70 A

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
9 V
Filament Current
240 A
Amplification Factor
34
Transconductance
27500 uS

Other

Maximum Anode Voltage
12000 V
Maximum Anode Dissipation
27000 W
Maximum Grid Dissipation
1250 W
Maximum/Peak Cathode Current
70 A
Frequency at Full Ratings
50 MHz

Capacitance

Anode-Grid Capacitance
51 pF
Anode-Cathode Capacitance
1.5 pF
Grid-Cathode Capacitance
68 pF

Construction

Cooling
Forced air

Data set 02

1971 English Electric Valve

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Anode dissipation BR189
27 kW
BR189
Output power class C telegraphy
30 kW
ClassC