Do all Cary amps have a 'Cary' sound ?

IMHO and short experience Cary amps have a certain "house" sound on the warm and pleasure side.
Of course there is variation between a 300B SET and a V12 push pull, they are different ways to work, but always keeping the warmth.

If you compare to QuickSilver or AudioResearch you'll understand that Cary's just a waste of money...
Only good for chamber music and nothing else.

"QuickSilver or AudioResearch" ? Cary pretty much kicks both their asses. AR - great for tube destruction, if you have too many tubes on your hands. As ugly as the worst solid-state gear. Quicksilver - their 8417 and some of the silver 60, silver 90 stuff might be ok. But overall, mostly all Fugly gear, and ho-hum sonically, from my experience. Cary CAD300sei or 805 will trounce both those brands.

-Ed

they make everything from flea-sized single ended to megawatt push-pull, so you should narrow your focus a little... Most if not all of the higher-powered amps can be converted to triode (at the cost of about half of the power...) so there's another important difference in sound 'signature'. Make sure, if you're buying used, to check with Cary to see what upgrades have been offered since the amp's inception and which, if any, have been done on the unit. Those can make a huge difference! And finally, amp-speaker interaction is always critical, so factor that in.