Kimber vs Jensen coupling caps in Cary amps

Yes, the difference in capacitors is clearly audible. You should think about the power supply caps if yours has electrolytics.
These power supply caps will transform your preamp if you have the room.

A few links to suppliers of other caps:

http://www.diyhifisupply.com

http://www.diycable.com/main/default.php?cPath=35&Cid=47a6afe7f07f8631553191c625665e2b

http://www.percyaudio.com/Catalog.pdf

http://www.partsconnexion.com/catalog/CapacitorsFilm.html

Oh yeah, while you're at it get rid of the electrolytic cathode bypass caps too and replace with film caps. They are just as much a part of the signal path as the coupling caps.

Bottom line: electrolytics sound like crap no matter where they are. The exception is the expensive Black Gates, but they only sound their best when charged up all the time so the amp must be left on all the time, not practical with a tube amp.

Coupling caps are not a must in tube amps. All of my amp stages are transformer coupled and the only caps are oil/film caps in the power supplies.