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Voltage Pentode - Sharp Cutoff (single) ·Pentode

6SH7

Sharp-cutoff high-transconductance pentode for fixed-gain RF and IF amplification in professional high-frequency equipment.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
RMA 8BK
Socket code
IO
Base pins
8
Nominal heater
6.3 V / 300 mA

Description

Sharp-cutoff RF pentode.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
RMA 8BK
Socket code
IO
Base pins
8
Nominal heater voltage
6.3 V
Nominal heater current
300 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

RMA 8BK - 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
900000 Ω
Transconductance
0.0049 S
Max plate voltage
330 V
Max screen voltage
165 V
Max plate dissipation
3.3 W
Max screen dissipation
0.77 W

Absolute maximum values promoted; typical transconductance read as 4900 micromhos at 250 V plate / 150 V screen.

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

1948 Brimar Radio Valve Manual

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Heater Voltage

    6.3 V

  • Heater Current

    300 mA

Data set 02

1953 RFT Rundfunk Technik

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • HeaterVoltageNominal

    6.3 V

    Nominal

  • HeaterCurrentNominal

    300 mA

    Nominal

  • Maximum Plate Voltage

    300 V

  • Maximum Screen Voltage

    150 V

  • Maximum Plate Dissipation

    3 W

  • Maximum Screen Dissipation

    0.7 W

Characteristic

  • Transconductance

    4900 µS

    Typical

  • Plate Resistance

    900000 ohm

    Typical

Data set 03

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Maximum plate voltage

    300 V

    Published handbook rating

  • Maximum screen voltage

    150 V

    Published handbook rating

  • Plate voltage

    250 V

    ClassA OperatingPoint1

  • Screen voltage

    150 V

    ClassA OperatingPoint1

  • Control-grid bias

    1 V

    ClassA OperatingPoint1

  • Plate current

    10.8 mA

    ClassA OperatingPoint1

  • Screen current

    4.1 mA

    ClassA OperatingPoint1

Characteristic

  • Plate resistance

    900000 ohm

    ClassA OperatingPoint1

  • Transconductance

    4900 µS

    ClassA OperatingPoint1

  • Heater voltage

    6.3 V

    Published heater rating

  • Heater current

    300 mA

    Published heater rating

Data set 04

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate Voltage

    250 V

    ClassA

  • Screen Voltage

    150 V

    ClassA

  • Grid Voltage

    -1 V

    ClassA

Characteristic

  • Plate Current

    10.8 mA

    ClassA

  • Screen Current

    4.1 mA

    ClassA