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The epitaxial planar process
Back in 1960 when I got my Ham licence I was a keen member of the WIA VHF group and we had along to one of our meetings a rep. from Fairchild (probably around 1962) who explained the epitaxial process to us and showed a new transistor "2N3564" this device we quickly got to work at 576Mhz, a frequency unheard of with transistors up until then, and you could buy 10 of them for the price of 1 OC170 the common RF transistor of the period.
I had one working as a preamp at 576 MHZ the worked better than a 417a, the standard low noise uhf amplifier triode valve. NOTE: these exotic valves on the wish list of UHF experimenters were not in the price range of hams.
Barry
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