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Voltage Pentode - High Frequency (single) ·Pentode

6968

Ruggedized miniature pentode designed for wideband high-frequency amplification and intermittent operation separated by long standby periods.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
78D
Socket code
B7G
Base pins
7
Nominal heater
6.3 V / 175 mA

Description

THE 6968 IS A WIDE-BAND HIGH-FREQUENCY AMPLIFIER IN THE 7 PIN MINIATURE CONSTRUCTION. THE DESIGN OF THE HEATER CATHODE PERMITS INTERMITT ENT OPERATION WITH LONG PERIODS

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
78D
Socket code
B7G
Base pins
7
Nominal heater voltage
6.3 V
Nominal heater current
175 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

78D - 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
Transconductance
0.005 S
Max plate voltage
200 V
Max screen voltage
155 V
Max plate dissipation
1.65 W
Max screen dissipation
0.55 W
Max cathode current
20 mA
Rectifier max heater-cathode voltage
135 V

Published promoted fields populated from the datasheet; identical repeated sections compressed 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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

  • Grid To Plate Capacitance

    0.02 pF

    Maximum

  • Input Capacitance

    4 pF

  • Output Capacitance

    2.85 pF

Data set 02

1966 Tung Sol Electronic Tubes 4 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater voltage

    6.3 V

    Nominal

  • Heater current

    175 mA

    Nominal

  • Maximum plate voltage

    200 V

    Promoted published value

  • Maximum screen voltage

    155 V

    Promoted published value

  • Maximum plate dissipation

    1.65 W

    Promoted published value

  • Maximum screen dissipation

    0.55 W

    Promoted published value

  • Maximum cathode current

    20 mA

    Promoted published value

  • PLATE VOLTAGE

    200 V

    MAXIMUM RATINGS

  • GRID 2 VOLTAGE

    155 V

    MAXIMUM RATINGS

  • GRID 1 VOLTAGE, NEGATIVE, DC

    50 V

    MAXIMUM RATINGS

  • GRID1 VOLTAGE, POSITIVE, DC

    0 V

    MAXIMUM RATINGS

  • PLATE DISSIPATION

    1.65 W

    MAXIMUM RATINGS

  • CATHODE CURRENT, DC

    20 mA

    MAXIMUM RATINGS

  • GRID 1 CURRENT, DC

    1 mA

    MAXIMUM RATINGS

  • BULB TEMPERATURE AT HOTTEST POINT

    165 C

    MAXIMUM RATINGS

  • ALTITUDEA

    60000 ft

    MAXIMUM RATINGS

  • PLATE VOLTAGE

    120 V

    CLASS A AMPLIFIER

  • GRID 2 (SCREEN) VOLTAGE

    120 V

    CLASS A AMPLIFIER

  • GRID 1 (CONTROL-GRID) VOLTAGE —

    2 V

    CLASS A AMPLIFIER

  • PLATE CURRENT 5.0 7.5 it MA.

    7.5 mA

    CLASS A AMPLIFIER

  • GRID 2 CURRENT

    4 mA

    CLASS A AMPLIFIER

  • MAXIMUM PLATE CURRENT (Ecl =-15.0 V)

    100 mA

    CHARACTERISTICS WITH EF=6.3 VOLTS,

Characteristic

  • THE 6968 IS A WIDE-BAND HIGH-FREQUENCY AMPLIFIER IN THE 7 PIN MINIATURE CONSTRUCTION.

    7 A

  • PLATE VOLTAGE

    150 V

    CHARACTERISTICS WITH EF=6.3 VOLTS,