BR191B

High-power Marconi transmitting triode intended for professional RF service. The available manufacturer record does not support sufficiently reliable detailed operating figures in this pass, so the description remains conservative rather than inferring unverified ratings or frequency limits.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 12.6 V / 29 A

Description

Forced-air-cooled VHF transmitting triode for television, FM broadcast, and industrial 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: 29 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

Amplification factor: 29
Max plate voltage: 6200 V
Max plate dissipation: 3000 W
Max grid dissipation: 300 W
Max cathode current: 10 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
12.6 V
Filament Current
29 A
Amplification Factor
29

Other

Maximum Anode Voltage
6200 V
Maximum Anode Dissipation
3000 W
Maximum Grid Dissipation
300 W
Maximum/Peak Cathode Current
10 A
Frequency at Full Ratings
220 MHz
Typical RF Output Power
5.5 kW
Grounded-grid Class C, to 110 MHz

Capacitance

Anode-Grid Capacitance
18.5 pF
Anode-Cathode Capacitance
0.5 pF
Grid-Cathode Capacitance
19 pF

Construction

Cooling
Forced air