>Anyone that likes to tinker in electronics I recommend they try their hand at at least one tube project (probably an amp of some kind).

Only if they are aware of the voltages and current often associated with tube setups. One bad move can be painful, or fatal in some cases.

I used to work on guitar amplifiers, doing modifications on tube amps. Messing around with the internals demanded my focus, a level of attention most "tinkerers" aren't likely ready for. Not trying to gatekeep here, just suggesting it may not be something for "anyone that likes to tinker".