AM/FM mono radio information

[2litre]

Hi All,

I've been reading on and off about about AA5 radios on this site:

http://www.funwithtubes.net/

It seems to me (total novice) to be quite informative, but it deals almost exclusively with mini tube AM radios.

Are there any sites that that explain or break down AM/FM units?

I'd like to know more about Octal tube (early?) and mini-tube (later?) AM/FM radios, thier differences, similarities and relative merits.

R/

Jim