Cassette Tapes..Dolby B or C?


I still have a tape deck in my system, and have a few tapes that are nice for quiet background music. The tape deck has a switch to select Dolby B or Dolby C (or none). There seems to be no marking on prerecorded tapes to indicate the type of Dolby processing. On a tape I was just playing B sounds about right. Should I assume that all prerecorded tapes are B unless otherwise stated?
eldartford
I own a Yamaha cassette deck with Dolby B&C, which I purchased in the mid eighties. It's a mid-fi deck...certainly not high end, but also a step above consumer (I think...).

I used primarily TDK SA tape, with an occasional Maxell thrown in.

Talk about making digital sound like analog! Good Dolby C cassette recordings of CDs still sound wonderful, in my opinion.
All this talk about, TDK, Nakamichi, Dolby has brought back fond memories, I think I am going to service my Nakamichi this weekend :-)
I've looked at the Nakamichi Dragon's listed for sale as if they were puppies in a pet store window, until I've been brought back to earth by reading of the service/reliability issues with this particular cassette deck. But, they sure look nice!
Tvad

It rounds the CDs and softens the high frequency fatigue?

And throws in the tiniest amount of tape hiss - enough to get sentimetal about analogue?
Tvad,

In my opinion the best ones were CR7A and 1000, the Dragon was a top deck but tempermental.