Moving-Coil Speakers.
HIS type .of speaker has up to now been very little in evidence in New Zealand, owing to the fact that neither comprere speakc's or the necessary stings have been imported. To keep wei posted in the matter, an : icle is beiz..:. prepared for next week, giving a full description of the principle involved and gencral construction. An A.C. Sereen Grid. A SCREEN grid valve for a.c, operation us now appeared in America. It differs little in appearance from the familiar 222, except that a cathode hzater is included, and the outer screen is a square iesh of wire astead of a spiral coil, The ordinary four-prong UX buse is use, the cathode being e¢on1ceted to the A 7 osit:.e terminal, thus obyiating the: necessity for a fifth prongs. |
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Radio Record, Volume II, Issue 6, 24 August 1928, Page 27
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131Moving-Coil Speakers. Radio Record, Volume II, Issue 6, 24 August 1928, Page 27
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