NJ7P SQL Tube Database Query

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7289
Planar Triode

EIA Base & Outline

Application

The 7289 is a metal-and-ceramic, high-mu triode designed for use as a grounded-grid CW oscillator, amplifier, or frequency multiplier at frequencies as high as 2500 MHz.

In addition, it may be used as a plate-pulsed oscillator or amplifier at frequencies as high as 3000 MHz.

Features of the 7289 include planar electrode construction, high plate dissipation capability, excellent electrode isolation, low radio-frequency losses, high transconductance, and low interelectrode capacitances.

Mechanical Data

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 1.0 A

Direct Interelectrode Capacitances (approx)

Triode
Input ......................................... 6.3 pf
Output ........................................ 0.035 pf
Grid to Plate ................................. 2.0 pf

Maximum Ratings (Design Center Values)

Triode
Plate Voltage ................................. 1000 V
Plate Dissipation ............................. 100 W

Characteristics and Typical Operation

Class C Amplifier (500 MHz)
Plate Voltage ................................. 900 V
Grid No. 1 Voltage ............................ -40 V
Grid No. 1 Current ............................ 30 mA
Plate Current ................................. 90 mA
Driving Power ................................. 6 W
Power Output (approx) ......................... 40 W

Class C Oscillator/Amplifier (2500 MHz)
Plate Voltage ................................. 900 V
Grid No. 1 Voltage ............................ -22 V
Grid No. 1 Current ............................ 10 mA
Plate Current ................................. 90 mA
Power Output (approx) ......................... 17 W

Class C Oscillator/Amplifier-Pulsed (3000 MHz)
Plate Voltage ................................. 3500 V
Grid No. 1 Current ............................ 1800 mA
Plate Current ................................. 3000 mA
Power Output (approx) ......................... 1600 W

If you are uncertain about the EIA designator for a particular tube please use the "Index" button to list all the tubes in the database. You can click on the designator for the closest tube.

(c) 1994-2021 by William A. Beech, NJ7P

Fri, 24 Jun 2022 19:16:05 -0700