I have the Yaqin MS 300 SET (integrated) Amp. The tube compliment is a pair of 300b Power tubes, a pair of 6sn7 driver tubes, a pair of 12AT7 voltage regulators and the 5u4gb rectifier tube.
My first question is, does rolling the 12at7 tubes make a major difference in the sonic presentation? In other word, would it be wise to invest in quality nos tubes? I dont know the role the voltage regulator tubes play in the presentation.
Secondly, if you were rolling tubes on this amp, what would your priority order be? and why?
Thanks for any insight you can give