1B8GT

Directly heated portable-receiver combination tube containing diode detector, triode audio voltage amplifier, and beam-power output sections for compact battery-operated radios.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: -
Socket code: IO
Base pins: 8
Nominal heater: 1.4 V / 100 mA

Description

Directly heated combination diode, triode, and power-amplifier pentode with separate Class-A triode and pentode operating data.

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: 1.4 V
Nominal heater current: 100 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

3 physical sections, each with unique specifications.

Section 1

Beam Power

X-ray radiationInterelectrode capacitances

Transconductance: 0.00115 S

Published ratings and characteristics promoted where clearly legible in the approved source.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 240000 Ω
Transconductance: 0.000275 S

Published ratings and characteristics promoted where clearly legible in the approved source.

Section 3

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Published ratings and characteristics promoted where clearly legible in the approved source.

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.

No source-specific operating conditions are recorded.