I love the little 12B4, especially with my Pi Two Towers! These are the speakers I initially heard the amp on in Tulsa and the main reason I bought it. There is plenty of bass and volume in my 12'X15' bedroom. Very smooth mids as expected. Jef added a bandwidth limiter on this amp, and it seems to do well with it.I had a hiccup where the fuse blew once, right at switch on. It was hardwired in, so I put in a fuse holder and put in a new 1A/slo-blo and looked the other way upon turn on :). Checked all the voltages, etc...No problems since with fuses blowing, so I'm not sure what it was.
The Seduction does not do well with my 12B4 amp, but I have not experimented with different IC's, carts, etc... yet, but I'm sure it is just a combination of things at this point and can be corrected more to my liking.