It is nice having practical experience in tube circuits and tube equipment repair and operation in general. The first thing is does is teach you respect for high voltage. Second, it's more related to the fundamental electrical theory of charged particles, separation of those charged particles by usually Thermionic emission , electric fields across space (vacuum) and potential/kinetic energy of those particles being accelerated by electric fields. The fundamental solid-state physics of basic transistor theory is more involved in the material science properties of atoms in order and disorder due to doping and junctions. This makes the direct effect of charges and fields to their operation more obscured to the beginner.I agree that a short dabble in practical circuits helps build a base, but although I was fortunate that my personal journey started in the valve/tube era, through the transistor to the IC which resulted in a broad practical experience with electronics in general.
But today , in a practical sense, my first go-to when faced with a need to solve an electronics issue, is to look for an answer using a Pic Micro

