1E8

Very-low-power directly heated pentagrid converter for portable superheterodyne receivers. It combines oscillator and mixer functions while drawing only about 40 mA from a 1.25 V filament.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 8CN
Socket code: B8G
Base pins: 8
Nominal heater: 1.25 V / 40 mA

Description

Directly heated pentagrid converter for frequency-converter 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: 8CN
Socket code: B8G
Base pins: 8
Nominal heater voltage: 1.25 V
Nominal heater current: 40 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

8CN - 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: 400000 Ω
Transconductance: 0.00015 S
Max plate voltage: 67.5 V
Max screen voltage: 45 V

Pentagrid converter section.

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

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

Maximum plate voltage
67.5 V
Maximum screen-grid voltage
45 V
Oscillator grid current
0.07 mA
Converter
Oscillator grid resistor
100000 Ohm
Converter
Plate voltage
67.5 V
Converter
Screen-grid voltage
67.5 V
Converter
Control-grid voltage
0 V
Converter
Plate current
1 mA
Converter
Screen-grid current
1.5 mA
Converter
Plate resistance
400000 Ohm
Converter
Conversion transconductance
150 uS
Converter