B36

Octal indirectly heated double triode designed for voltage-amplifier service, providing two similar triode sections for general low-frequency amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: IO
Base pins: 8
Nominal heater: 12.6 V / 300 mA

Description

The Marconi B36 is a octal indirectly heated double triode for voltage-amplifier service.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: IO
Base pins: 8
Nominal heater voltage: 12.6 V
Nominal heater current: 300 mA
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

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 7700 Ω
Transconductance: 0.0026 S
Amplification factor: 20
Max plate voltage: 300 V
Max plate dissipation: 2.5 W

Representative section for two equal triode systems.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 7700 Ω
Transconductance: 0.0026 S
Amplification factor: 20
Max plate voltage: 300 V
Max plate dissipation: 2.5 W

Second physical triode 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

Triode

Other

Heater voltage
12.6 V
Heater current
300 mA
Maximum plate voltage
300 V
Maximum plate dissipation per section
2.5 W

Characteristic

Amplification factor
20
Transconductance
2600 uS
Plate resistance
7700 ohm

Capacitance

Grid-plate capacitance
2.5 pF
Grid-cathode capacitance
2.6 pF
Plate-cathode capacitance
0.3 pF