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  2. List of vacuum tubes - Wikipedia

    en.wikipedia.org/wiki/List_of_vacuum_tubes

    The "CV4000" numbers identify special-quality valves though SQ valves CV numbered before that rule came in retain their original CV number: CV4007 = E91AA – SQ version of 6AL5 CV4010 = E95F – SQ version of 6AK5 or EF95

  3. Valve amplifier - Wikipedia

    en.wikipedia.org/wiki/Valve_amplifier

    A valve amplifier or tube amplifier is a type of electronic amplifier that uses vacuum tubes to increase the amplitude or power of a signal. Low to medium power valve amplifiers for frequencies below the microwaves were largely replaced by solid state amplifiers in the 1960s and 1970s.

  4. Klystron - Wikipedia

    en.wikipedia.org/wiki/Klystron

    The simplest klystron tube is the two-cavity klystron. In this tube there are two microwave cavity resonators, the "catcher" and the "buncher". When used as an amplifier, the weak microwave signal to be amplified is applied to the buncher cavity through a coaxial cable or waveguide, and the amplified signal is extracted from the catcher cavity.

  5. Pentode - Wikipedia

    en.wikipedia.org/wiki/Pentode

    The term most commonly applies to a three-grid amplifying vacuum tube or thermionic valve that was invented by Gilles Holst and Bernhard D.H. Tellegen in 1926. [1] The pentode (called a triple-grid amplifier in some literature [ 2 ] ) was developed from the screen-grid tube or shield-grid tube (a type of tetrode tube) by the addition of a grid ...

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  7. How much should you have in your 401(k)? Here's how your ...

    www.aol.com/finance/average-401k-balance-by-age...

    Remember that guidelines are not set in stone — rather, they're good rules to follow. For instance, if you’re 30 years old and earn $75,000, you should try to have that much saved in your 401(k).