Will an outside DAC over ride the tubes

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?

Yes, I enjoy RUSH, especially in the car.

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.