Preamp w/ Single Line Input. But I have DAC and CDP

Yes, provided the CD player has digital output run it through the DAC. I f you like the sound as well as the stand alone player, problem solved. If the stand alone player sounds better then you might search out another DAC.

As you seem happy with your system as is, i would not be inclined to advise replacing your pre when wishing to just add additional digital sources. What source (s) are you going to use with the DAC?

Glad to hear you have solved your problem and enjoy the result.

There are many others that can provide you with better insights to your problem than I, however I will give it a go.

The problem could be either at the coax output of the CDP or Coax input of the DAC. It can always be a bad cable however since you had an intermittent problem with the IC this might not be the case. Since the problem seems to be at both inputs of the DAC lets start with the CDP. Can you borrow another player, even an inexpensive DVD player, to run into your DAC as a way to remove your CDP as the problem?

You should also try another cable to best remove that as a possibility.

Which Cambridge DAC do you have? Was it purchased new or used?

Take it one step at a time.

I was watching your other thread concerning this. The idea of a switchbox also occurred to me however have never used one. One thought I had was to contact Schiit audio, they make a 2 input passive pre for $50. It could be used as a switchbox by leaving the volume control fully open. Possibly Schiit could make one sans volume or the volume could be circumvented. I am getting caught up just thinking out loud here, as Al’s recommendation of the DB system switchbox would certainly solve the problem.

I, as others have stated, have to believe the DAC in your CDP is better than the Cambridge. Either way I would want to take advantage of the tube output stage it has.

Yes, let us know how that Schiit works out!

Great! Happy New Year!