Personally I like what the classic 6SN7 vacuum tube does for opening up the soundstage and the 3 dimentional images it produces,along with the 5AR4 rectifier tube. Please add your opinions and why.
I used very expensive mullard NOS 6922's in my Audible Illusions M3A and got only a small improvement, but that could be because the M3A is so good that it is hard to improve.
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