I never gave the stock tubes a fair chance. Meaning, did not used them for an extended period of time.My setup exact - minus the tubes ( which are on the way in the mail, currently on stock )
How big of an upgrade did you find the 6NP3-DR tubes to be compared to stock, marginal / big improvement?
Not sure how hard Sundara is to drive compared to LCD2C, I'll pick them up the LCD2C I get the cost approved by my wife.
For the short period I had them installed, compared to now, the bass sounds more tight and defined, now with the 6NP3-DR (I love cellos and bass on baroque pieces).