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This is a list of vacuum tubes or thermionic valves, and low-pressure gas-filled tubes, or discharge tubes. Before the advent of semiconductor devices, thousands of tube types were used in consumer electronics.
Uranium glass used as lead-in seals in a vacuum capacitor. Glass-to-metal seals are a type of mechanical seal which joins glass and metal surfaces. They are very important elements in the construction of vacuum tubes, electric discharge tubes, incandescent light bulbs, glass-encapsulated semiconductor diodes, reed switches, glass windows in metal cases, and metal or ceramic packages of ...
A hermetic seal is any type of sealing that makes a given object airtight (preventing the passage of air, oxygen, or other gases). The term originally applied to airtight glass containers but, as technology advanced, it applied to a larger category of materials, including metals , rubber , and plastics .
Torr-Seal, or its generic equivalent Hysol-1C (US brand name) or Loctite 9492 (EU brand name), is an epoxy with resin and hardener for use in vacuum environments. It will begin to degrade at high temperatures but otherwise is very stable with very little outgassing. Other vacuum-rated epoxies are also available.
Ultima II and Turbo Ultima II (The Ultima II was a basic Ultima for beginners. The Turbo Ultima II had Gold shocks,full bearings and ball differential. Both models had the new Kyosho "Kelron" chassis.) Outlaw Ultima ST (The only Stadium truck made from the original Ultima II chassis. Kelron chassis and aluminum front shock towers with long shocks.
Ampex 601 playing a recording of "Les Paul's New Sound, Vol. II". Made in Redwood City, California, c. 1956. Internals of Ampex Fine Line F-44, a 3-head Ampex home-use audio tape recorder, c. 1965 AMPEX model 300 half-inch three-track recorder AMPEX 440 (2tr, 4tr) & 16-track MM 1000