DavidS, you have great gear from all I've read, having not heard those pieces. I just want to say I feel a little stuck here, because the last thing I want to do is say Hemps (or similar) are the only way to get good guitar replay. Since I started using them it has just been an obvious virtue of theirs vs. other drivers I've tried, and that's my only point, ymmv. Hey, some could say it's a distortion not a virtue, right?! And I suspect in part it's because they have a tilted upper midrange through treble (I deal with that with xo and/or adding a tweeter).
Funny tho because I've been reading Dave Ellis' site lately and appreciate his, and Dennis Murphy's, approach. These are sensible people, and I bet the 1801's are great. I'm not just being diplomatic because I realize my approach is more on the subjective side in gear choices - paper cones and tubes for instance. I WANT a little of those "distortions" of a touch of sweetness and emotion in the playback. Dave and Dennis represent a more rational approach to me. Tho it's notable that Dave has gone far in testing subjective sound of caps for his 1801's, so maybe we're not at all on opposite sides, I don't think we are. I would like to hear the 1801's, and also build Dennis' plop in the box to hear them (GR Research M130 midwoofers, BG NEO3 PDR tweeters).
BTW, tried other power tubes? 6550's, KT88's, KT77's besides EL34? I'm sure you have. I'm building an el34 amp soon and will be trying different tubes to learn.
Don