I would beg to differ! An FET (the T means transistor) is essentially a triode and functions much the same as a vacuum tube triode although at a much lower voltage. the only difference between an NPN transistor and a vacuum tube triode is that the transistor requires a positive (+) to turn it on and a vacuum tube triode (and an FET) requires a negative (-) bias to turn it off. Otherwise both an NPN transistor and a vacuum tube triode are exactly analogous. The emitter is analogous to the cathode, the base is analogous to the grid and the collector is analogous to the plate. With an FET the source is analogous to the cathode (although there are both N-channel and P-channel FETs which have the opposite polarities) the gate is analogous to the grid and the drain is analogous to the plate. All of the mentioned devices have three connections which function in almost exactly the same way and intrinsically do so at the quantum level. Besides, intrinsically, triode means three electrodes. Both transistors and vacuum tubes have both Newtonian and quantum characteristics. However for the most part we use the smooth curves of the "real" world to describe their characteristics while any transfer of energy happens in distinct quanta. Both transistor and vacuum tube noise are quantum phenomena but they are usually expressed as DB in the analog world and mostly irrelevant in the digital world. All energy converted in a resistor can be expressed in the simple formula E=IR where E is volts, I is Amperes, and R is Ohms. Algebraically it is a linear function but at the quantum level Schrodinger's cat has the final say. You might just as well have said that everything is intrinsically quantum mechanical which adds nothing to the conversation. Diodes were discovered before quantum mechanics was even a theory and so were electricity and x-rays. There was great controversy as to whether light was composed of particles or waves because it has the characteristics of both. To learn basic electronics and Newtonian physics does not at all require any knowledge of quantum mechanics at all. I learned about donors and holes in semiconductors and electrons, neutrons, and protons in my electronics class and also noise but it really wasn't necessary to know to do design work with either transistors or vacuum tubes. In fact it was many years later that I even heard about quantum mechanics. It is commendable that somebody is curious enough to want to know electronics and physics. In fact a basic grounding in Physics should be ma