How did second generation computers different from first generation computers?

In most systems of classifying computers into generations, first generation computers used vacuum tubes while second generation computers used discrete transistors. Some differences: first - big, second - not so big first - generated lots of heat, second - generated less heat first - high voltages, second - low voltages first - tube heaters burn out, second - transistors don't have heaters first - needed on site manufacturer engineering support, second - needed on call manufacturer engineering support.

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