959

Directly heated acorn sharp-cutoff pentode designed for dry-cell battery RF amplifier service. It combines compact high-frequency construction with low-power filament operation for portable receiving equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 5BE
Socket code: ACORN7
Base pins: 7
Nominal heater: 1.25 V / 50 mA

Description

Directly heated acorn sharp-cutoff pentode for dry-cell battery RF-amplifier service.

Socket description

Acorn radial 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 5BE
Socket code: ACORN7
Base pins: 7
Nominal heater voltage: 1.25 V
Nominal heater current: 50 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

5BE - 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

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 800000 Ω
Transconductance: 0.0006 S
Max plate voltage: 145 V
Max screen voltage: 67.5 V

Published amplifier ratings and Class A characteristics promoted.

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

Pentode

Other

Maximum plate voltage
145 V
Published handbook rating
Maximum screen voltage
67.5 V
Published handbook rating
Plate voltage
135 V
ClassA
Screen voltage
67.5 V
ClassA
Control-grid bias
3 V
ClassA
Plate current
1.7 mA
ClassA
Screen current
0.4 mA
ClassA

Characteristic

Plate resistance
800000 ohm
Published handbook characteristic
Transconductance
600 µS
Published handbook characteristic
Heater/filament voltage
1.25 V
Published heater/filament rating
Heater/filament current
50 mA
Published heater/filament rating

Data set 02

1960 RCA Industrial and Communications Types

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

HeaterOrFilamentVoltage
1.25 V
HeaterOrFilamentCurrent
50 mA
Application
Dry-cell battery RF amplifier

Data set 03

1971 RCA HB3 Binder 3 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Filament voltage
1.25 V
Nominal
Filament current
50 mA
Nominal
Maximum DC plate voltage
145 V
Amplifier
Maximum DC screen voltage
67.5 V
Amplifier
DC plate voltage
135 V
ClassA
DC screen voltage
67.5 V
ClassA
DC control-grid voltage
-3 V
ClassA
DC plate current
1.7 mA
ClassA
DC screen current
0.4 mA
ClassA

Capacitance

Grid-to-plate capacitance
0.015 pF
Maximum; with shield baffle
Input capacitance
1.8 pF
Output capacitance
2.5 pF

Characteristic

Plate resistance
0.8 Mohm
ClassA; approximate
Transconductance
600 uS
ClassA