Tube types

@jond  thank you, that's great. Appreciate your help. 

@yogiboy  thank you. I wasn't aware of the CCa version. I see they're expensive! 

@rodman99999  thank you. I'll certainly take a look. I guess tube rolling could potentially be rather expensive in order to find the best combination 

Have you guys found that switching to premium tubes has been a significant improvement?

@jea48 thank you for the link. There's a lot for me to learn...

@dill thanks for the link. Never heard of them... they sound like a bargain if the performance is that good.

@wlutke thanks; I appreciate posting your experiences. 

@rodman99999 good to know that switching just one of the tubes in my pre to a premium would make a big difference. 

Every tube, tried in that pre(there were a number), made a distinct difference in the system's presentation.  

Which one impressed you the most?