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Voltage Pentode - Remote Cutoff (single) ·Pentode

34

Variable-mu high-frequency amplifier pentode. Manufacturer documentation identifies it for controlled-gain RF amplification, using the extended-cutoff characteristic characteristic of early automatic-volume-control receiver stages.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
4M
Socket code
IO
Base pins
7
Nominal heater
2 V / 60 mA

Description

Variable-mu high-frequency amplifier pentode.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
4M
Socket code
IO
Base pins
7
Nominal heater voltage
2 V
Nominal heater current
60 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

4M - 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
400000 Ω
Transconductance
0.00062 S
Amplification factor
620
Max plate voltage
180 V
Max screen voltage
67.5 V

Published promoted fields populated by semantic section ownership.

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

1932 Cunningham Radio Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Grid-plate capacitance

    0.02 pF

    Published direct interelectrode capacitance

Data set 02

1937 Raytheon Radio Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Maximum plate voltage

    180 V

    Published datasheet rating

  • Maximum screen voltage

    67.5 V

    Published datasheet rating

  • Plate voltage

    180 V

    ClassA

  • Screen voltage

    67.5 V

    ClassA

  • Control-grid bias

    3 V

    ClassA

  • Plate current

    2.8 mA

    ClassA

  • Screen current

    1 mA

    ClassA

Characteristic

  • Plate resistance

    1000000 ohm

    Published datasheet characteristic

  • Transconductance

    620 µS

    Published datasheet characteristic

  • Amplification factor

    620

    Published datasheet characteristic

  • Heater/filament voltage

    2 V

    Published heater/filament rating

  • Heater/filament current

    60 mA

    Published heater/filament rating

Capacitance

  • Input capacitance

    6 pF

    Published capacitance

  • Output capacitance

    11.5 pF

    Published capacitance

  • Grid-to-plate capacitance

    0.015 pF

    Published capacitance

Data set 03

193X Cunningham

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Heater/filament voltage

    2 V

    Published nominal

  • Heater/filament current

    60 mA

    Published nominal

  • Transconductance

    650 uS

    Published characteristic

Data set 04

1940 RCA

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Heater or filament voltage

    2 V

    Published nominal value

  • Heater or filament current

    60 mA

    Published nominal value

  • Transconductance

    620 µS

    Published representative/high operating value

  • Amplification factor

    620

    Published representative/high operating value

  • Plate resistance

    1000000 ohm

    Published representative/high operating value

  • Remote-cutoff transconductance

    15 µS

    At -22.5 V bias

Data set 05

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • HeaterOrFilamentVoltage

    2 V

  • HeaterOrFilamentCurrent

    60 mA

Data set 06

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

  • Input capacitance

    6 pF

    Section1

  • Output capacitance

    1 pF

    Section1

  • Grid-to-plate capacitance

    0.015 pF

    Section1

Other

  • Plate voltage

    180 V

    ClassA

  • Screen voltage

    67.5 V

    ClassA

  • Control-grid voltage

    -3 V

    ClassA

  • Plate current

    2.8 mA

    ClassA

  • Screen current

    1 mA

    ClassA

Characteristic

  • Plate resistance

    1000000 Ω

    ClassA

  • Transconductance

    620 µS

    ClassA

Data set 07

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Plate Resistance

    400000 ohm

    PlateVoltage=250V

  • Transconductance

    1050 uS

    PlateVoltage=250V