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  2. Harbor Freight jack stand recall: Now the replacement stands ...

    www.aol.com/news/harbor-freight-jack-stand...

    In May, Harbor Freight recalled more than 1.7 million Pittsburgh-branded three- and six-ton jack stands that could collapse due to a manufacturing flaw. The flaw on those stands came from worn ...

  3. Grid dip oscillator - Wikipedia

    en.wikipedia.org/wiki/Grid_dip_oscillator

    Grid dip oscillators were first developed in the 1920s and were built with vacuum tubes.The devices displayed the amplitude of the tube's grid current, hence GDO.. Modern dip meters are solid-state devices, and are sometimes called gate dip oscillators or emitter dip oscillators in reference to the analogous part of the transistor whose current is measured instead of a vacuum tube grid. [1]

  4. Harbor Freight Tools - Wikipedia

    en.wikipedia.org/wiki/Harbor_Freight_Tools

    Harbor Freight Tools won a declassification of the class action; that is, the court found that all the individual situations were not similar enough to be judged as a single class, and that their claims would require an individual-by-individual inquiry, so the case could not be handled on a class basis.

  5. Pentagrid converter - Wikipedia

    en.wikipedia.org/wiki/Pentagrid_converter

    Circuit symbol of a heptode. The development of the pentagrid or heptode (seven-electrode) valve was a novel development in the mixer story. The idea was to produce a single valve that not only mixed the oscillator signal and the received signal and produced its own oscillator signal at the same time but, importantly, did the mixing and the oscillating in different parts of the same valve.

  6. List of railroad truck parts - Wikipedia

    en.wikipedia.org/wiki/List_of_railroad_truck_parts

    An axlebox, also known as a journal box in North America, is the mechanical subassembly on each end of the axles under a railway wagon, coach or locomotive; it contains bearings and thus transfers the wagon, coach or locomotive weight to the wheels and rails; the bearing design is typically oil-bathed plain bearings on older rolling stock, or roller bearings on newer rolling stock.

  7. Jack (device) - Wikipedia

    en.wikipedia.org/wiki/Jack_(device)

    A jack which can lift a mobile home. A jack is a mechanical lifting device used to apply great forces or lift heavy loads. A mechanical jack employs a screw thread for lifting heavy equipment. A hydraulic jack uses hydraulic power. [1] The most common form is a car jack, floor jack or garage jack, which lifts vehicles so that maintenance can be ...

  8. File:Gate-dip-oscillator-schematic.png - Wikipedia

    en.wikipedia.org/wiki/File:Gate-dip-oscillator...

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  9. Electron-coupled oscillator - Wikipedia

    en.wikipedia.org/wiki/Electron-coupled_oscillator

    ECO oscillator schematic. In the vacuum-tube radio, an electron-coupled oscillator or ECO oscillator uses a screen-grid tube with the cathode, control grid and screen grid forming the elements of the frequency-generating circuit while the plate is in the output circuit, shielded from the oscillator circuit proper by the screen grid.

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