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  2. Vacuum tube - Wikipedia

    en.wikipedia.org/wiki/Vacuum_tube

    A vacuum tube consists of two or more electrodes in a vacuum inside an airtight envelope. Most tubes have glass envelopes with a glass-to-metal seal based on kovar sealable borosilicate glasses, although ceramic and metal envelopes (atop insulating bases) have been used.

  3. Western Electric (tube manufacturer) - Wikipedia

    en.wikipedia.org/wiki/Western_Electric_(tube...

    Western Electric Export Corporation (or simply Western Electric) is a manufacturer of vacuum tubes and high end audio gear. Based in Rossville, Georgia, the company builds an ultra-premium version of the 300B electron tube. It traces its roots to 1872 with the Bell Telephone Company and the original Western Electric.

  4. 12AX7 - Wikipedia

    en.wikipedia.org/wiki/12AX7

    12AX7 (also known as ECC83 [1]) is a miniature dual- triode 6AV6 vacuum tube with high voltage gain. Developed around 1946 by RCA engineers [2] in Camden, New Jersey, under developmental number A-4522, it was released for public sale under the 12AX7 identifier on September 15, 1947.

  5. All American Five - Wikipedia

    en.wikipedia.org/wiki/All_American_Five

    All American Five. The term All American Five (abbreviated AA5) is a colloquial name for mass-produced, superheterodyne radio receivers that used five vacuum tubes in their design. These radio sets were designed to receive amplitude modulation (AM) broadcasts in the medium wave band, and were manufactured in the United States from the mid-1930s ...

  6. Triode - Wikipedia

    en.wikipedia.org/wiki/Triode

    A triode is an electronic amplifying vacuum tube (or thermionic valve in British English) consisting of three electrodes inside an evacuated glass envelope: a heated filament or cathode, a grid, and a plate ( anode ). Developed from Lee De Forest 's 1906 Audion, a partial vacuum tube that added a grid electrode to the thermionic diode ( Fleming ...

  7. Sovtek - Wikipedia

    en.wikipedia.org/wiki/Sovtek

    Sovtek is a brand of vacuum tube owned by Mike Matthews's New Sensor Corporation and manufactured in Saratov, Russia. They are often used in guitar amplification and include versions of the popular 12AX7, EL84, EL34, and 6L6 vacuum tubes.