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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.
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.3 A
Triode
Input ......................................... 3.65 pf
Output ........................................ 0.015 pf
Grid to Plate ................................. 1.75 pf
Triode
Plate Voltage ................................. 200 V
Plate Dissipation ............................. 2.0 W
Class A Amplifier
Plate Voltage ................................. 300 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
Thu, 30 Jun 2022 16:39:28 -0700