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2. Cavity magnetron - Wikipedia

   en.wikipedia.org/wiki/Cavity_magnetron

   In microwave-excited lighting systems, such as a sulfur lamp, a magnetron provides the microwave field that is passed through a waveguide to the lighting cavity containing the light-emitting substance (e.g., sulfur, metal halides, etc.). Although efficient, these lamps are much more complex than other methods of lighting and therefore not ...

3. Goldring (audio company) - Wikipedia

   en.wikipedia.org/wiki/Goldring_(audio_company)

   Goldring moved to England in 1933. In 1954, the company released 500 British-made magnetic cartridges; the 600 and 700 models followed in 1958 and 1960, respectively. The 1970s saw the release of the Lenco GL85 turntable (1973) and of the 900SE II and 900/E cartridges. In 1987, Goldring was sold to Veda-UK (Armour Home Electronics).

4. Rat-race coupler - Wikipedia

   en.wikipedia.org/wiki/Rat-race_coupler

   Rat-race coupler. A rat-race coupler, also known as a hybrid ring coupler, is a type of coupler used in RF and microwave systems. In its simplest form, it is a 3 dB coupler and is thus an alternative to a magic tee.

5. Magic tee - Wikipedia

   en.wikipedia.org/wiki/Magic_Tee

   A magic tee (or magic T or hybrid tee) is a hybrid or 3 dB coupler used in microwave systems. [1] It is an alternative to the rat-race coupler . In contrast to the rat-race, the three-dimensional structure of the magic tee makes it less readily constructed in planar technologies such as microstrip or stripline .

6. Microwave cavity - Wikipedia

   en.wikipedia.org/wiki/Microwave_cavity

   A microwave cavity or radio frequency cavity (RF cavity) is a special type of resonator, consisting of a closed (or largely closed) metal structure that confines electromagnetic fields in the microwave or RF region of the spectrum. The structure is either hollow or filled with dielectric material. The microwaves bounce back and forth between ...

7. 45 rpm adapter - Wikipedia

   en.wikipedia.org/wiki/45_rpm_adapter

   A plastic 45 rpm adapter that inserts into the large spindle hole of a 45 rpm record. A 45 rpm adapter (also known as a 45 rpm record insert, 45 rpm spindle adapter, spider, or 7-inch adapter in reference the usual size of a 45 rpm record) is a small plastic or metal insert that goes in the middle of a 45-rpm record so it can be played on the standard size spindle of a turntable.