Yes, the digital output of your player bypasses the player's internal DAC and tubed output stage.
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Both Ghostrider45 and Tobias are correct.
I have never seen the purpose of a digital out on a tubed CD player. Digital inputs would be much more helpful.
By the way, if you do this don't remove the output tube, but replace it with a cheap one. Your output stage may require on even if the output stage is not used.
Thanks for all the input, it is not that I dislike it I just wanted to try something new. I have the stock tube in the cayin and it sounds like I will just upgrade the tube. How much do I have to spend to get something with a noticeable change. I am thinking about 60 to 80 dollars, is this a reasonable cost????
And hey Ghostrider45, are you a RUSH fan?
Here's a site that details some of the various flavors that can be experienced with different 12AU7 family tubes: (https://www.tubeworld.com/12au7.htm) My own choice would be the Siemens E82CC(Spec. Qual., triple mica) or Telefunken ECC802S, both known for their lack of coloration/microphonics/noise.