1LB6

Battery heptode converter with exceptionally high plate resistance for oscillator and mixer service in portable superheterodyne receivers. Very low filament consumption emphasizes battery economy over maximum conversion gain.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 8AX
Socket code: B8G
Base pins: 8
Nominal heater: 1.4 V / 50 mA

Description

1LB6 is listed as a pentagrid mixer in the supplied receiving-tube handbook. It uses a 1.4 V, 0.05 A directly heated filament. The handbook publishes maximum ratings and representative operating characteristics for its intended service.

Socket description

Loctal 8-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 8AX
Socket code: B8G
Base pins: 8
Nominal heater voltage: 1.4 V
Nominal heater current: 50 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

8AX - 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

Heptode

X-ray radiationInterelectrode capacitances

Plate resistance: 2000000 Ω
Transconductance: 0.0001 S
Max plate voltage: 90 V
Max screen voltage: 67.5 V

Published handbook maximum ratings and representative operating characteristics reviewed.

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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

Plate Voltage
90 V
Mixer Operation
Screen Voltage
67.5 V
Mixer Operation
Peak Oscillator Grid Voltage
10 V
Minimum
Plate Current
0.4 mA
Screen Grid Current
2.2 mA

Characteristic

Conversion Conductance
100 µS
Ec1=0 V
Conversion Conductance
5 µS
Ec1=-4.5 V

Data set 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

Maximum plate voltage
90 V
Published handbook rating
Maximum screen voltage
67.5 V
Published handbook rating
Plate voltage
90 V
ClassA
Screen voltage
67.5 V
ClassA
Control-grid voltage
0 V
ClassA
Plate current
0.4 mA
ClassA
Screen current
2.2 mA
ClassA

Characteristic

Plate resistance
2000000 ohm
Published handbook characteristic
Transconductance
100 µS
Published handbook characteristic
Filament voltage
1.4 V
DirectlyHeated DC filament
Filament current
50 mA
DirectlyHeated DC filament