Trade Developments

Radio Record, Volume III, Issue 16, 1 November 1929, Page 3

Trade Developments

Wew Speakers and Sets THE new Kyle condenser type loudspeaker is claimed to give more perfect reproduction over all the high and low frequencies than any other present-day speaker, As the name implies; this invention consists of two metallic plates separated by a special dielectric called Kylite, a substance named after the inventor. .The unit is immersed in a bath of low-current high-voltage electrical energy. In order to provide the high voltage necesSary to charge the surfaces of the speaker, a devjce known as a polarizer is employed. This consists of a small tfansformer to provide 450 volts, a dlocking condenser, and a rectifying valve of the 201A type. This polarizing device, which is part of the complete speaker, makes the unit adaptable to any standard radio receiver, regardless of the type of valves used. Since . the thickness of this new speaker is approximately one-eighth of an inch, its use in factory-built sets will enable the use of smaller, consoles than are now required. rome NEW all-electric radio receiver of note is the eight-valve "Peerless Courier," a set embodying many pre-sent-day improvements. The most notable is the use of three stages of screened grid, which gives maximum ‘selectivity and stability. It also incorporates single-dial tuning and pushpull amplification. ‘Peerless Couriers" 4ean be .obtained in various models, notable among which is model 653. This is a 46-inch high console, the front and doors of which are of matched burl, walnut overlaid with burl maple. This receiver can be obtained either with a moving-coil type speaker, or with "the Kylestron," the "electros- . tatic"? speaker of wide possibilities which has been described. A MERICAN~papers state: According to a patent decree recently handed down by the United States Patent , Office, the Magnavox Company secures exclusive use of the word "Dynamic" in connection with radio loudspeakers, telephone receivers, and parts. The Magnavox Company advises that the "dynamic" trade mark has been continuously used and applied to its merchandise since 1915. The recognition of this trade-mark by the Patent Office establishes the priority of Magnavox the dynamic field. ° Apart from the notification in this issue, the Magnavox Company has officially announced its sole right to the word "Dynamic."