Originally Posted by
bonzo
If the 242s worked in your system no other tube will sound close. 242s sometime distort due to high gain and impedance mismatch with pre, but if they work, they will kill everything else.
Btw, 300bs are all different, and I have already tried the special 300bs from the Pacific.
As for PX4, the PX25 and the special 45s are both better than the PX4s - but usually both may not work in a particular system, one or the other will. This is due to the fact that each Lampi and system have different gains, and there is some impedance matching with the pre.