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Specialized - Traveling Wave ·TravelingWave

F2508

Stable permanent-magnet-focused backward-wave oscillator for electronically tunable microwave generation in swept-signal, radar, ECM, frequency-diversity, or local-oscillator applications.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
6.3 V / 960 mA

Description

The F2508 is a highly stable, permanent-magnet-focused backward-wave oscillator for swept-signal, frequency-diversity transmitter, radar, and ECM local-oscillator applications.

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
960 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

1 physical section, each with unique specifications.

Section 1

TravelingWave

X-ray radiationInterelectrode capacitances
Max plate voltage
250 V
Max cathode current
25 mA

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 ITT

Published operating points and test conditions from this source.

SECTION 1

TravelingWave

Characteristic

  • Frequency Range

    1 to 2 GHz

  • Power Output

    100 to 800 mW

  • Minimum Output Power

    100 mW

  • Heater Voltage

    6.3 V

  • Heater Current Typical

    960 mA

  • Spurious Output Below Signal Minimum

    40 dB

Other

  • Heater Current Maximum

    1.2 A

  • Anode Voltage Maximum

    250 V

  • Anode Current Maximum

    1 mA

  • Cathode Current Maximum

    25 mA

  • Helix Current Maximum

    10 mA

  • Collector Voltage Maximum

    150 V

    With respect to helix

Capacitance

  • Cathode-to-All-Electrodes Capacitance Maximum

    50 pF

  • Grid-to-All-Electrodes Capacitance Maximum

    45 pF

  • Helix-to-All-Other-Electrodes-and-Capsule Capacitance Maximum

    300 pF