So where should the tubes be?

Tubes should go where they sound good to you and work well with your other components.  It's really about your listening priorities.  I personally enjoy tubes in all my components and have speakers that respond well to tubes.  Some people really like the dynamics of SS components while others enjoy a mix.  There is no "right" answer and it's a question mainly of personal taste once you get past some general compatibility questions.  Don't let anyone tell you that only tubes sound like music - there is an entire market who only enjoy SS components and they are not "wrong". Such blather is ridiculously off-putting.

So there you go. Use tubes wherever you want music.

some of your audio idols like Fremer and Lavigne love their SS amps and believe they actually produce music.  Why so polarizing and disenfranchising of so many people at every opportunity? (rhetorical question)

@tomic601   

Three Easy….he doesn’t know a FET is solid state

Even his beloved Herron phono stage has a FET-based MC gain stage.  It's a great phono no doubt but probably the least tubey one I've ever heard.  Amazingly the Herron still sounds like music even when playing MC carts!