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  2. List of vacuum tubes - Wikipedia

    en.wikipedia.org/wiki/List_of_vacuum_tubes

    If the first digit is 4, the tube has a 4 V heater; Otherwise, the last two digits give the heater current in tens of mA. A following letter D indicates more than one grid, not counting a space charge grid Examples: [23] A2118 = B2038 = REN1821 = R2018 – Triode, 180 mA (=18×10 mA) heater; H2018D = B2042 = RENS1820 = S2018 – RF Tetrode, 180 ...

  3. Four Thirds system - Wikipedia

    en.wikipedia.org/wiki/Four_Thirds_system

    Olympus also made 1.4× and 2× teleconverters and an electronically coupled extension tube. Sigma has adapted 13 lenses for the Four Thirds System, ranging from 10 mm to 800 mm, including several for which no equivalent exists: the fast primes (30 mm f /1.4 and 50 mm f /1.4) and extreme telephoto (300–800 mm f / 5.6). As of 2014 all Sigma ...

  4. Image intensifier - Wikipedia

    en.wikipedia.org/wiki/Image_intensifier

    An image intensifier or image intensifier tube is a vacuum tube device for increasing the intensity of available light in an optical system to allow use under low-light conditions, such as at night, to facilitate visual imaging of low-light processes, such as fluorescence of materials in X-rays or gamma rays (X-ray image intensifier), or for conversion of non-visible light sources, such as ...

  5. Ford Modular engine - Wikipedia

    en.wikipedia.org/wiki/Ford_Modular_engine

    The 5.4 L features multi-port fuel injection, roller finger followers, fracture-split powder metal connecting rods, and in some applications a forged steel crankshaft. [54] The 2-valve SOHC 5.4 L engine was on the Ward's 10 Best Engines list for 1997–1998 and 2000–2002. Vehicles equipped with the 16-valve SOHC 5.4 L include the following:

  6. List of Mullard–Philips vacuum tubes - Wikipedia

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

    EL151 – Power pentode, Y10A steel tube 10-pin base; EL152 – 40 W AF/SW/VHF Radiation-cooled power pentode. EL112 or EL401 with a B10V glass 10-pin base with one big pin for the anode; FL152 with a different heater; EL153 – SW/VHF power pentode; EL156 – Power pentode, Y10A steel tube 10-pin base; EL171 – 4-Watts Power pentode, gnome tube

  7. Pontiac V8 engine - Wikipedia

    en.wikipedia.org/wiki/Pontiac_V8_engine

    4.342 in × 3 + 3 ⁄ 4 in (110.3 mm × 95.3 mm) bore x stroke, 8 cylinders, each having a bore of 4.342 inch and a stroke of 3.75 inch, results in a displacement of 444.21 cubic inches (7,279.34 cc); for the Pontiac OHC 427 Hemi refers to it as a "TOHC" and lists the bore at 4.257 inch—which, with a stroke of 3.75 inch, results in a ...

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