![]() Another advantage of the electronic motor was that the deck could operate without conversion in both 50Hz and 60Hz markets, something which Philips exploited by selling the GA 202 in the USA under its Norelco brand name.Ĭlever though this motor was, it did not produce a lot of torque and ran best at speeds faster than are normal for turntable applications. The motor was sufficiently flexible to allow the speed-changing mechanism to be dispensed with altogether, 33.33, 45 and 78rpm being selected electronically.įine-speed tuning was also included, with pre-set adjustments for each of the three positions. It was therefore possible to construct a feedback servo loop where the motor could be made to run accurately at any speed, automatically compensating for changes in load and temperature. It had a tacho generator fitted to its shaft so that the speed could be measured electronically. Instead of this, the Philips design used a small DC motor of a type similar to that found in a cassette recorder. Note the Philips GP 400 'Super M' cartridge ![]() Instead of cranks and levers the deck was operated by delicate electronic logic controls. ![]()
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