push-pull output
81The David Berning Company — Established in 1974, The David Berning Company manufactures tube audio amplifiers utilizing the patented[1] ZOTL Impedance Conversion Technology that properly matches high impedance vacuum tubes to the low impedance realm of speakers without the… …
82Transformer — This article is about the electrical device. For the toy line franchise, see Transformers. For other uses, see Transformer (disambiguation). Pole mounted distribution transformer with center tapped secondary winding. This type of transformer is… …
83Ultra-Linear — is a term used to describe a type of electronic circuit that is used to couple a tetrode or pentode vacuum tube (also called electron valve ) to a load (e.g. to a loudspeaker).The circuit was developed by Alan Blumlein and patented in 1937 (… …
84Secure Digital — SDHC redirects here. For the gene, see SDHC (gene). SD, SDHC, SDXC SD (top), miniSD, microSD cards Media type Memory card Capacity SDSC (SD): 1 MB to 2 GB although 4 GB cards are available SDHC: 4 GB to 3 …
85Wireless World — was the pre eminent British magazine for radio and electronics enthusiasts. It was one of the very few informal journals which were tolerated as a professional expense. History The Marconi Company published the first issue of the journal The… …
86History of radar — The history of radar starts with experiments by Heinrich Hertz in the late 19th century that showed that radio waves were reflected by metallic objects. This possibility was suggested in James Clerk Maxwell s seminal work on electromagnetism.… …
87DB Class E 10 — Deutsche Bundesbahn Baureihe E 10 110 451 2 with a Regionalexpress at Hannover Hauptbahnhof, 2003 03 18 Power type Electric Builder Krupp, Henschel, Krauss Maffei (m …
88Antique radio — DIORA AGA RSZ 50 ca.1947 from Poland An antique radio is a radio receiving set that is collectible because of its age and rarity. Although collectors may differ on the cutoff dates, most would use 50 years old, or the pre World War II Era, for… …
89Notable historic valve amplifier designs — Some of the best known valve amplifiers are listed here.Leak TL/12The first commercially produced amplifier with distortion of 0.1% was the LEAK Type 15 Point One of 1945, using KT66 vacuum tubes (valves) connected as triodes, with 26dB feedback… …
90North American railroad signals — Main article: North American railway signaling Baltimore and Ohio Railroad Color Position Light bracket masts at Magnolia, West Virginia North American railroad signals generally fall into the category of multi headed electrically lit units… …
