So, Shadorne, why is the corner about the worst place to put a TT?
Simply because this is the BEST place to put a bass trap...you have the strongest bass room modes occuring about 6 inches to a foot out from a corner....so this is not what you would want to expose a TT too.
I don't know about you - but when I play loudly many things will vibrate in the room - you can easily feel it to the touch.
I have all my gear in enclosed heavily braced MDF cabinets on the ground (which is concrete) - every amp and player is no more than 6 inches from this concrete floor. Complete wooden enclosures mean that acoutic energy is probably reduced by at least 30 db SPL inside these cabinets. If I had tubes or a TT, I would probably find a way to place them in another room - as SPL levels are often too high to be able to avoid audible microphonics in that type of gear.
When I used to own a TT and system in the same room - microphonics was a constant and audible problem - I admit that I tend to listen loud to esepcially dynamic recordings so this may affect me much more than others...