For what it's worth, the CV181 is NOT electrically equivalent to a 6SN7. If you replace a 6SN7 with a CV181, it is bound to sound different, because the CV181 is operating at a different part of its performance envelope. But people do it. Have fun.
Raul, I think one reason that SS has taken a back seat to tubes at the higher end of the audiophile spectrum is that most of the SS gear to which we are exposed is built to a (low) price point, and if you look inside, you see crappy capacitors, bad layout, fail-safe circuit designs, for example using over-size electrolytic coupling capacitors, that assure mediocrity. There are only a few SS products built purely for max performance with cost no object. Perhaps you should start a thread to discuss this phenomenon and name some of the best SS products currently and previously available.
Raul, I think one reason that SS has taken a back seat to tubes at the higher end of the audiophile spectrum is that most of the SS gear to which we are exposed is built to a (low) price point, and if you look inside, you see crappy capacitors, bad layout, fail-safe circuit designs, for example using over-size electrolytic coupling capacitors, that assure mediocrity. There are only a few SS products built purely for max performance with cost no object. Perhaps you should start a thread to discuss this phenomenon and name some of the best SS products currently and previously available.