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2. List of vacuum tubes - Wikipedia

   en.wikipedia.org/wiki/List_of_vacuum_tubes

   U7B base. 6.3 volt heater version of type 53 which had a 2.5 volt heater. Octal version – 6N7. 6A7 and 6A8 (PH4, X63) – Pentagrid converter – dual tetrode style. Based on type 2A7, which had a 2.5 volt heater. 6A7 has a UX7 base with top cap connection for control grid (grid 4

3. Crystal oscillator - Wikipedia

   en.wikipedia.org/wiki/Crystal_oscillator

   A crystal oscillator is an electric oscillator type circuit that uses a piezoelectric resonator, a crystal, as its frequency-determining element. Crystal is the common term used in electronics for the frequency-determining component, a wafer of quartz crystal or ceramic with electrodes connected to it. A more accurate term for "crystal" is ...

4. Engineered stone - Wikipedia

   en.wikipedia.org/wiki/Engineered_stone

   Engineered stone is a composite material made of crushed stone bound together by an adhesive to create a solid surface. The adhesive is most commonly polymer resin, with some newer versions using cement mix. This category includes engineered quartz (SiO 2 ), polymer concrete and engineered marble stone. [ 1]

5. US says it's preparing for 'significant' Iran attack on ... - AOL

   www.aol.com/us-says-preparing-significant-iran...

   Advertisement. The White House is warning that the United States assesses Iran could launch a retaliatory attack on Israel as early as "this week," and that the U.S. has to be prepared for an ...

6. CDC reveals leading causes of death for the past 5 years ...

   www.aol.com/lifestyle/top-causes-death-stayed...

   Here are five big takeaways. 1. Heart disease and cancer are still the leading causes of death. For more than 100 years, heart disease has been the number one No. 1 cause of death in the U.S, and ...

7. A man dubbed ‘pirate of the unknown’ is extradited to US in ...

   www.aol.com/news/man-dubbed-pirate-unknown...

   A citizen of Montenegro nicknamed the “pirate of the unknown” was extradited to New York City from Italy to face charges connected to what US authorities called an international drug ring that ...