Port City Amps is working on a high end all-tube bass amp, and I've been lucky enough to be part of the feedback loop over the first iterations of the prototype head and cabinets.
If you want to hear it, here is a clip of me trying out the head through my Bergantino HT112. The settings are totally flat, with the bright switch on:
YouTube - portcityamps's Channel
So far I am very impressed with the sound quality and punch of this amp, I am really looking forward to having one of these babies for myself. My main suggestion so far was to add some switches. The amp now sports some rotary style knobs for the bass and midrange, similar to the Mesa Carbine, with cut, flat and boost, as well as a bright switch.
Although we were using my Bergantino in the video, the plan is to create a 1x15" and a 2x10" cab.
Feel free to give feedback on the amp regarding features ("nice to haves", "must haves", etc), and I will be glad to relay it back to Port City Amps.
Jordan