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  2. 12AU7 - Wikipedia

    en.wikipedia.org/wiki/12AU7

    12AU7 is also known in Europe under its Mullard–Philips tube designation ECC82. [1] There are many equivalent tubes with different names, some identical, some designed for ruggedness, long life, or other characteristics; examples are the US military 5814A and the European special-quality ECC82 and E182CC.

  3. 12AX7 - Wikipedia

    en.wikipedia.org/wiki/12AX7

    12AX7 (also known as ECC83 [1]) is a miniature dual-triode 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.

  4. List of vacuum tubes - Wikipedia

    en.wikipedia.org/wiki/List_of_vacuum_tubes

    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.

  5. 12AT7 - Wikipedia

    en.wikipedia.org/wiki/12AT7

    12AT7 (also known in Europe by the Mullard–Philips tube designation of ECC81) is a miniature nine-pin medium-gain (60) dual-triode vacuum tube popular in guitar amplifiers. It belongs to a large family of dual triode vacuum tubes which share the same pinout (EIA 9A), including in particular the very commonly used low-mu 12AU7 and high-mu 12AX7.

  6. 6SN7 - Wikipedia

    en.wikipedia.org/wiki/6SN7

    The 6SN7 was considered to be obsolete by the 1960s, replaced by the 12AU7, and became almost unobtainable. With the introduction of semiconductor electronics, vacuum tubes of all types ceased to be manufactured by the major producers. A small demand for vacuum tubes in guitar amplifiers and very

  7. Thousands of fake Forever Stamps seized by customs agents in ...

    www.aol.com/thousands-fake-forever-stamps-seized...

    CHICAGO (CBS) — Thousands of counterfeit Forever Stamps were seized at the Chicago International Mail Branch last weekend, U.S. Customs and Border Protection announced Thursday.

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