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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. List of Mullard–Philips vacuum tubes - Wikipedia

   en.wikipedia.org/wiki/List_of_Mullard–Philips...

   Most post-war European thermionic valve (vacuum tube) manufacturers have used the Mullard–Philips tube designation naming scheme. Special quality variants may have the letter "S" appended, or the device description letters may be swapped with the numerals (e.g. an E82CC is a special quality version of an ECC82)

4. Category:Vacuum tubes - Wikipedia

   en.wikipedia.org/wiki/Category:Vacuum_tubes

   Pages in category "Vacuum tubes" The following 160 pages are in this category, out of 160 total. ... 12AU7; 12AX7; 12BV7; 25L6; 50L6; 300B; 807 (vacuum tube) 833A ...

5. 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.

6. Amperex Electronic - Wikipedia

   en.wikipedia.org/wiki/Amperex_Electronic

   Philips continued to improve and enlarge the tube plant in New York, but also used the Amperex name to distribute their new line of Dutch-made miniature tubes, (12AX7, 12AU7, 12AT7) to feed the booming U.S. hi-fi market. Classic hi-fi brands such as Marantz, Fisher, and H. H. Scott, Inc., used these tubes.

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