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Voltage - Triode (with diode, heptode or hexode) ·Diode-Diode-Triode

6R7

Double-diode low-mu triode combining detector and AVC functions with a comparatively strong current-driving amplifier. Paired diodes provide rectification while the low-resistance triode favors current drive.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
3
Base
8
Socket code
IO
Base pins
8
Nominal heater
6.3 V / 300 mA

Description

Indirectly heated double-diode medium-mu triode for diode detection and triode amplification.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
8
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

8 - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

3 physical sections, each with unique specifications.

Section 1

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Source-derived section; promoted values populated where applicable.

Section 2

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Source-derived section; promoted values populated where applicable.

Section 3

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
8500 Ω
Transconductance
0.0019 S
Amplification factor
16
Max plate voltage
250 V

Source-derived section; promoted values populated where applicable.

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

1937 Raytheon Radio Receiving Tubes

Published operating points and test conditions from this source.

SECTION 3

Triode

Capacitance

  • Grid-to-plate capacitance

    2.5 pF

    Section1

  • Input capacitance

    5.5 pF

    Section1

  • Output capacitance

    4 pF

    Section1

Other

  • Plate voltage

    250 V

    ClassA

  • Grid bias

    -9 V

    ClassA

  • Plate current

    9.5 mA

    ClassA

  • Load resistance

    10000 Ω

    ClassA

  • Power output

    280 mW

    ClassA

Characteristic

  • Plate resistance

    8500 Ω

    Section1

  • Transconductance

    1900 µS

    Section1

  • Amplification factor

    16

    Section1

Data set 02

1940 RCA

Published operating points and test conditions from this source.

SECTION 3

Triode

Other

  • t 316 MAX. as a combined detector, amplifier,

    316

    t 316 MAX. as a combined detector, amplifier,

  • HeaTeR VOLTAGE (A. C.or D.C).v.oviiaint

    6.3 V

    HeaTeR VOLTAGE (A. C.or D.C).v.oviiaint. 6.3 Volts

  • HEATER CURRENT ..tivitinnnnnnnenannancenennes

    300 mA

    HEATER CURRENT ..tivitinnnnnnnenannancenennes 0.3 Ampere

  • PLATE VOLTAGE .. .iviiinrnrnrnenruasnncessnaas 250 max. Volts

    250 V

    PLATE VOLTAGE .. .iviiinrnrnrnenruasnncessnaas 250 max. Volts

  • GRID VOLTAGE i evvevrvnanenoenosnanarnenenens

    -9 V

    GRID VOLTAGE i evvevrvnanenoenosnanarnenenens -9 Volts

  • AMPLIFICATION PACTOR ..............ccccvvnnnn

    16

    AMPLIFICATION PACTOR ..............ccccvvnnnn 16

  • PLATE CURRENT «.vttvinrnrnnnnnnnanncneananas

    9.5 mA

    PLATE CURRENT «.vttvinrnrnnnnnnnanncneananas 9.5 Milliamperes

  • UnNDISTORTED POWER OUTPUT.........cvvvnvennn

    280 W

    UnNDISTORTED POWER OUTPUT.........cvvvnvennn. 280 Milliwatts

  • As a transformer-coupled amplifier, the triode unit of the 6R7 may be

    6

    As a transformer-coupled amplifier, the triode unit of the 6R7 may be

Characteristic

  • GRID-PLATE CAPACITANCE . ......covevnannnnnnns

    2.5 pF

    GRID-PLATE CAPACITANCE . ......covevnannnnnnns 2.5 puf

  • GRID-CATHODE CAPACITANCE .. ..otveeunanncesens

    5.5 pF

    GRID-CATHODE CAPACITANCE .. ..otveeunanncesens 5.5 puf

  • PLATE RESISTANCE ....iiiiiiincecnnennncnarenns

    8500 ohm

    PLATE RESISTANCE ....iiiiiiincecnnennncnarenns 8500 Ohms

  • TRANSCONDUCTANCE .. tvvervennnneeansnnasnnns

    1900

    TRANSCONDUCTANCE .. tvvervennnneeansnnasnnns 1900 Micramhos

  • LOAD RESISTANCE .. ...ivvrinennennecosncasonns

    10000 ohm

    LOAD RESISTANCE .. ...ivvrinennennecosncasonns 10000 Ohms

Data set 03

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 3

Triode

Other

  • Typical plate current

    9.5 mA

Data set 04

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

  • Heater voltage

    6.3 V

  • Heater current

    300 mA

  • Plate voltage

    260 V

    Typical operating conditions

  • Plate current

    9.5 mA

    Typical operating conditions

SECTION 2

Diode

Other

  • Heater voltage

    6.3 V

  • Heater current

    300 mA

  • Plate voltage

    260 V

    Typical operating conditions

  • Plate current

    9.5 mA

    Typical operating conditions

SECTION 3

Triode

Other

  • Heater voltage

    6.3 V

  • Heater current

    300 mA

  • Plate voltage

    260 V

    Typical operating conditions

  • Plate current

    9.5 mA

    Typical operating conditions