NJ7P SQL Tube Database Query

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7644
Planar Triode

EIA Base & Outline

Source ........................................ GE1

Application

The 7644 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.

Within the limitations of its ratings, the 7644 nay be used in radar receivers, or similar applications, where the grid of the tube may be driven positive by leakage pulses.

The physical appearance and dimensions of the 7644 are identical to those of the 6299, and the electrical characteristics are nearly identical.

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 ................................. 300 V
Grid No. 1 Voltage ............................ 0 V
Amplification Factor .......................... 110
Plate Resistance (approx) ..................... 7300 Ω
Transconductance .............................. 15000 µMho
Plate Current ................................. 10 mA

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Thu, 30 Jun 2022 16:39:28 -0700