In the competitive scramble among TV-phonograph makers, any new sales idea is as good as gold. Last week Magnavox Co. announced one that it hopes will win nuggets of customer good will: a ten-year unconditional guarantee on its diamond stylus phonograph needles. The guarantee was possible because of the development of an automatic record changer with a tone arm that rests so lightly on records that the company says both needle and record will last longer.
Such developments have been a big factor in keeping once slow-moving Magnavox running with the leaders of the pack these days, particularly in the stereophonic...