Things never change but for the fools, they just evolve untill fools think is something new, but it is not, just an eveolution of whatever already existed, maybe more complex, maybe more complicated to analise, but still basically same thing recombined and remasterd.
I took a one years nights course in electronics when I was like 16 and studied all those things to can fix colour TV sets and computers, but is long time I have not used them; at the time computers still had visible resistors and capacitors in them... lol
That happened in the past millenium, mind yo how old am I.
Vacuum tubes electronics are more or less over, semiconductor transistors were invented not so long time afterwards.
Still some projects cannot do without them, including at CERN and vacuum tubes had transistors, diodes, etc.
The thing was moving to semiconductor materials from vacuum tubes but the basiscs remained, resistors, capacitors, diodas, transistors.
The problme that arised was the smaller the component the less room was available for markings like value, tollerance, etc. So they came up with the colour code.
Today witht he hyper miniaturisation when a chip the size of my fingernail and similar thickness has millions of this components inside, not even colour code works anymore, let alone repairing the chip for a fried transistor by replacing it, now you toss the whole chip and put a new one instead.
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