BR137B

Industrial transmitting power triode intended for RF amplification, oscillation, or modulation. Manufacturer data emphasize substantial plate power, professional transmitter operation, and construction suited to continuous high-power service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 19.5 V / 415 A

Description

The Marconi BR137B is a improved forced-air-cooled high-power transmitting triode for hf amplifier and oscillator 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: 19.5 V
Nominal heater current: 415 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: 0.035 S
Amplification factor: 43
Max plate voltage: 15000 V
Max plate dissipation: 20000 W
Max grid dissipation: 3000 W

Highest published service maximums promoted; cooling and operating conditions preserved in parameters.

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

Other

Heater/filament voltage
19.5 V
Heater/filament current
415 A
Maximum plate voltage
15000 V
Maximum plate dissipation
20000 W
Maximum grid dissipation
3000 W
Maximum frequency at full ratings
50 MHz

Characteristic

Amplification factor
43
Transconductance
35000 uS

Capacitance

Grid-plate capacitance
50 pF
Plate-cathode capacitance
3 pF
Grid-cathode capacitance
100 pF

Construction

Cooling
Forced air