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- 10:10, 7 April 2025 AugustusDevaney talk contribs created page Worldwide 7025 Vacuum Tubes Vacuum Tubes Prices. Finest Costs On A Daily Basis (Created page with "For over 40 years, Radio Electric Supply has provided the world with radio and vacuum tubes for every possible application. This can be either simply a filament covered with a mixture of barium and strontium oxides and other materials, or it can be an "indirectly heated" cathode, which is simply a nickel tube with a coating of these same oxides on its external surface and a home heating filament inside. <br><br>Whether you need vacuum tubes for market, hi-fi applications...")