The back is off the amp (head) as Harry Straub was voicing the thing as he shot these pix. It took him about a month to fine-tune the thing as he is very anal about the sound (That is what you are paying for after-all). Complicating matters was the new, extremely tight (and therefore hard to break-in) British Celestion 25W 16ohm Greenbacks. He played the hell out of the thing, and went through a bunch of tubes before he settled on the JJ EL-34's and 12AX7's.
You can see the Superbrights glowing, as well as those magic glass valves in the last pic.
The cab was custom-made to my specs by Bill over at Sultone who graciously allowed Harry to laser-engrave a matching Straub logo on his cab. Harry had both cabs finished in catalysing lacquer together (after engraving) so that they would match, and he supplied the raw speakers, wiring, jacks and the install. As Harry only hand-makes TEN amps a year, he was just too busy to handle the woodworking chores, so Bill got the nod. The workmanship is outstanding. You may have noticed the three-piece back (an option) which allows THREE cab configurations (i.e., closed-back, 1/3 open-back, and 2/3 open-back) depending on the venue and/or player's preference. You may also notice the trick Neutrik locking 1/4 parallel phone jacks and the Neutrik Parallel Speakons on the cab. I prefer Speakons, virtually unheard of in the guitar realm but commonplace in the bass-players realm, as they are superior to phone jacks in every way for high-current signals. The 1/4 jacks are for a safety net in case a Speakon cable fails...there's always a spare 1/4 speaker cable floating around at a gig somewhere, LOL!
You can also see one of the custom made flight cases Harry had made for the head and cab in the backround of the upper pic.