NJ7P SQL Tube Database Query

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7784
Planar Triode

EIA Base & Outline

Application

The 7784 is a high-mu, metal-and-ceramic triode intended for operation as a grounded-grid, Class A, radio-frequency amplifier at frequencies as high as 3000 MHz.

Features of the tube include small size, planar electrode construction with close spacing, inherent rigidity, and an envelope structure convienient for coaxial circuit applications.

At 1200 MHz a noise figure of less than 8.5 decibels may be obtained when the 7784 is used in a grounded-grid coaxial circuit. The 7784 differs from the 6299 only in having an isolated heater.

Mechanical Data

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.3 A

Direct Interelectrode Capacitances (approx)

Triode
Input ......................................... 3.65 pf
Output ........................................ 0.015 pf
Grid to Plate ................................. 1.75 pf

Maximum Ratings (Design Center Values)

Triode
Plate Voltage ................................. 200 V
Plate Dissipation ............................. 2.0 W

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 175 V
Grid No. 1 Voltage ............................ 0 V
Amplification Factor .......................... 110
Plate Resistance (approx) ..................... 7300 Ω
Transconductance .............................. 15000 µ
Plate Current ................................. 10 mA

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 18:07:01 -0700