generesq,
All I can say for sure is to audition the 300B if you can. 88dB sensitivity does not say much about the speaker. What if at a certain frequency the speaker have some nasty impedance swing? Say 3 to 2 Ohms at 15 khz. I doubt it if the 300B can follow because maybe it is not designed for that.
Doc,
How's the move goin? Let's say that I have a modest tube collection as compared to other people here and keep it like that okay?
As for the 401's, they are not for sale but you can have it if you know what I mean. They are almost extinct as poachers gets the best out of them nowadays so it is very difficult to find a pair (except that guy who lives far away and never wear shoes that happens to have several types of them). You know what, they sound much sweeter now with the 60's Sprague caps on the crossover. When you have time, we can have a listen.
BTW, the Macs are coming soon.
c-ya!