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Showing Extent to Which Leading Producers Assemble Sets WHAT MANUFACTURERS MAKE AND BUY -MANUFACTURERS 100 IADIO RECEIVER manufacturers will make in their own plants approximately 62 per cent, of the parts they require for use in their 1929-30 receivers. The remainder, or 38 per cent, of the parts, will be purchased from outside companies. All the manu- facturers will build their own r. f. tuning coils and practically all of them will build or as- semble their own audio and power transformers and filter choke coils. The parts which are generally purchased from outside companies are fixed and variable condensers, fixed and variable resistors, and cabinets. These are some of the con- clusions determined from a survey made recently by RADIO BROADCAST among prominent set manufacturers. Requests for the necessary data were sent to a list of 26 of the largest manufacturers, and, at the time of this writ- ing, replies have been re- ceived from 14. The manu- facturers who have replied are listed in this article. The list includes many of the largest and probably they will account for the sale of at least 75 per cent, of all the sets to be sold during the coming season. In gathering the data for this survey it was decided to concentrate on 17 different classifications of parts, it having been found that prac- tically every piece of appa- BUY MAKE MAKE & BUY «*•' O-r ' /V- i . ?<•///3 I I ratus that is ordinarily employed in radio receiver construc- tion would fall into one of these groups. The various classifications of parts are given in Table 1. The survey indicated wide variations in the practices of different companies. For example, one manufacturer makes 89 per cent, of all his parts and another prominent company makes only 6 per cent, of the parts, purchasing 94 per cent. It should be understood that the references in the preceding paragraphs to parts "made by the manu- facturer" means simply that the manufacturer does not buy the completed device, although he probably does buy the various components used in the particular part. For example, a manufacturer may not buy a complete audio transformer, but will purchase the coils and lami- nations and then assemble the transformer, from these parts, in his own plant. Table 1 gives a com- plete tabulation of the 14 replies received, indicating by an "x" in each case which parts are purchased and which are manufactured. In some cases it will be noted that an "x" appears under both headings, purchased and manufactured. The parts in which this double classifica- tion appears most frequently are fixed resistors and cab- inets. This probably means that many companies make the various small fixed resis- tors required in the set but 204 • AUGUST 1929