Why does Cary Audio keep discontinuing good amps?

Two more reasons:
The Cary 120 amp needed a re-design because it runs too hot inside the chassis. The british press caught it, the american press went GA-GA over it.
The SLP-05 preamp has a Tube Engineering 101 mistake: the tube rectifier is mounted horizontally inside a slim chassis with very little ventilation. Rectifier failures are very common and expensive.
I believe that after Dennis left, they are clueless technically and from a marketing POV.

Cary lost me when they went into home theater.

There really hasn't been much of new product other than the 120S in like 10 years.

The Cary V12 was a great amp and cost 4k. Ahh, the days.

They're simply going where the money is, home theatricals. I believe the days of Cary developing any new hard-wired point-to-point amps (especially triode) is over. I'm guessing the 120S is a circuit board design & Dennis designed it before he retired, who knows? Enjoy the classics!

Casouza - I have not heard about a lot of rectifier tube failures in the SLP 05. Are you talking for a theoretical point of view or are there a whole lot of poeple out their with failures on the SLP 05? Any references to such failures?

coz quicksilver is much better for less.
imho i don't like 'polite' and 'soft' amps like cary. i like 'em rude and vicious.