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Tube Tinker — Electron Tube Database
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Voltage - Triode (with diode, heptode or hexode) ·Diode-Diode-Diode-Triode

6R8

Triple-diode medium-mu triode combining several detector or discriminator functions with a relatively low-resistance amplifier. Three diode sections provide multiple rectification paths while the triode favors current drive.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
4
Base
-
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 450 mA

Description

The 6R8 is A TRIPLE-DIODE LOW-MU TRIODE USING THE 9 PIN MINIATURE CONSTRUCTION. IT IS DESIGNED FOR SERVICE AS A COMBINED AM/FM DETECTOR AND AF AMPLIFIER.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B9A
Base pins
9
Nominal heater voltage
6.3 V
Nominal heater current
450 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

4 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
8400 Ω
Transconductance
0.0019 S

Section 2

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Section 3

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Section 4

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this 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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater voltage

    6.3 V

  • Heater current

    450 mA

  • Plate voltage

    250 V

    Typical operating conditions

  • Plate current

    9.5 mA

    Typical operating conditions

SECTION 2

Diode

Other

  • Heater voltage

    6.3 V

  • Heater current

    450 mA

  • Plate voltage

    250 V

    Typical operating conditions

  • Plate current

    9.5 mA

    Typical operating conditions

SECTION 3

Diode

Other

  • Heater voltage

    6.3 V

  • Heater current

    450 mA

  • Plate voltage

    250 V

    Typical operating conditions

  • Plate current

    9.5 mA

    Typical operating conditions

SECTION 4

Diode

Other

  • Heater voltage

    6.3 V

  • Heater current

    450 mA

  • Plate voltage

    250 V

    Typical operating conditions

  • Plate current

    9.5 mA

    Typical operating conditions