Classic VALVE tuners?

Hi guys, I start to spend more times listening to radio recently. I recalled I'd asked regarding valve tuner but can't remember where the tread was. Would appreciate if someone can help here, I am keen into valve tuner (the old ones). I'd search brands like Scott, Fisher, and nearly confirm one in Ebay (lafayette 80B) until alot of question came in.

1) What is Multiplex wide band?
2) what if a valve tuner don't come with it -which always mention in Mcintoch and Scott.
3)does it works properly to my country running FM?
4)what is the weakness of valve tuner?

Thanks for sharing!!