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7108 Views 5 Replies Latest reply: May 29, 2014 11:05 AM by Prof_Schmidt RSS
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May 8, 2014 3:09 PM

Vacuum tubes versus solid state devices

What came first, solid state devices or vacuum tubes? I know vacuum tubes are old but I don't know if they came in after solid state had been developed and then replaced when solid state devices got better.

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