Anyone heard Cary 303/300 after 400 hours burn-in?

Worked fine & sounds great since I bought it new a couple years ago. I prefer the SS section to the tube in my setup running direct into the amp. I've even tried the recommended NOS Radiotechniques tubes. Upsampling off all the time. The 3V output of the 303 thru it's RCA's is just right in my rig.

I find that some recordings sound better SS, some with tube buffer; some with upsampling, some without.

OK, Late to the game. I just acquired a Cary CD 300.
Sounds great hooked to my Marantz. Transitioning to my Fisher 800C or Sansui 1000A. Haven't completed the rebuild yet of the Sansui( Opinions welcome to both.)
I have very limited knowledge of the Cary CD 300 and would like to know how to run tube vs SS, as I'm still gathering manuals etc.
Sounds great so far after fixing a ground and a belt for the eject. I keep the top unscrewed to give it a nudge to open the CD drawer.
What are all the available configuration options with this player?? How to configure them. Sorry I'm a fledgling in the Audiophile world. 
The guy I acquired this from had amazing music and  had some left in and around His Collection of Audio components. Just wished I found them before most were gone. I know this is an old thread. Thanks for any guidance.  I have other Receivers and amps but am heading in the Legacy direction, not the 25K+ direction. 
Speaker_ Don't give me S- but CW DC9, Klipsch Heresy, MK's, NHT's and almost, maybe Klipsch K Horns. Working on that. ( I like my Jazz and Rock) Hassle me if you want I have thick skin and limited budget! :-)
Thanks
Ken

Cerwin Vega DX9's;  I hate spell check

Hey skibrain1 - go to Cary Audio website at top go to "Support" then "Product Support" and you can download owners manuals for any of their past or present models.  I'm still using my 303/300 although awhile back I had to change out the laser drive unit (did myself that I bought from Cary).  I can't be much help w/upsampling - I always use mine in SS mode w/upsampling off.  Enjoy!