Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Power - Triode ·Triode

7698R

Radiator-equipped version of the rugged 7698 ceramic-metal planar triode. It retains high transconductance, low capacitance, pulse capability, and operation to roughly 2.5 GHz while incorporating an integral radiator.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
6.3 V / 1.3 A

Description

Radiator version explicitly covered by the 7211/7698 sheet; data apply in all respects.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
-
Base pins
-
Nominal heater voltage
6.3 V
Nominal heater current
1.3 A
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

1 physical section, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Transconductance
0.038 S
Amplification factor
80
Max plate voltage
2500 V
Max plate dissipation
100 W
Max grid dissipation
2 W
Max cathode current
150 mA

Promoted fields populated from published ratings/characteristics; additional published values retained in TUBE_SECTION_PARAMETER.

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

1962 Eimac

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

  • Grid-Cathode Capacitance

    8 pF

  • Grid-Plate Capacitance

    2.25 pF

  • Plate-Cathode Capacitance Maximum

    0.06 pF

Characteristic

  • Cutoff Bias Maximum

    -30 V

    Ip=1mA; Ep=1kV

Other

  • Frequency CW Maximum

    2.5 GHz

  • Pulse Plate Voltage Maximum

    3500 V

    PlatePulsed

  • Pulse Plate Current Maximum

    5 A

    PlatePulsed

  • Typical CW Useful Output

    45 W

    Frequency=700MHz

Data set 02

1975 Eimac Tube Manual

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Heater Current Range

    1.15 A to 1.45 A

  • Cathode Heating Time

    60 s

  • Cutoff Bias

    -30 V

Capacitance

  • Input Capacitance

    8 pF

  • Output Capacitance

    0.06 pF

  • Grid-Plate Capacitance

    2.25 pF

Other

  • Frequency Maximum

    3 GHz

  • Pulse Plate Voltage Maximum

    3500 V

    PlatePulsed

  • Pulse Current Maximum

    4.8 A

    PulseModulator

  • Pulse Duration Maximum

    6 us

  • Duty Factor Maximum

    0.0033

  • CW Plate Voltage Maximum

    2500 V

  • CW Plate Current Maximum

    150 mA

  • Grid Current Maximum

    45 mA

Data set 03

1976 Eimac Tube Manual

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Heater Current Range

    1.15 A to 1.45 A

  • Cathode Heating Time

    60 s

  • Cutoff Bias

    -30 V

Capacitance

  • Input Capacitance

    8 pF

  • Output Capacitance

    0.06 pF

  • Grid-Plate Capacitance

    2.25 pF

Other

  • Frequency Maximum

    3 GHz

  • Pulse Plate Voltage Maximum

    3500 V

    PlatePulsed

  • Pulse Current Maximum

    4.8 A

    PulseModulator

  • Pulse Duration Maximum

    6 us

  • Duty Factor Maximum

    0.0033

  • CW Plate Voltage Maximum

    2500 V

  • CW Plate Current Maximum

    150 mA

  • Grid Current Maximum

    45 mA