You know, I was so bummed out about what a contentious session this past weekend turned out to be, that I forgot to tell you guys about the perfectly WONDERFUL sounding combination that I discovered: Yes, my TR Onyx Sig head, and a late 60s Marshall 4 x 12 straight front cab with vintage Greenbacks! What's that you say? No way? Well, I gotta tell you...this combination was GORGEOUS in the room and to tape. The obnoxious guitar player's Matchless died several deaths - needed a new tranny, after several problems with the unusual tube in the amp (EF86?). So I offered to bring my Onyx to the session (not that the guy deserved it, but he IS a good player). Well, no one told me that he didn't bring his cab, and I didn't bring mine, so I asked the studio what they had. "Vintage 60s Marshall cab with vintage Greenbacks" said the engineer (I never thought that 60s Marshall cabs had greenbacks, I thought greenies were 70s speakers, so maybe they were retrofitted, speaker experts, tell me if I'm wrong). "We'll try that one," I said. I plugged in the Onyx and hoped for the best. I can't even describe how good this combination sounded in any meaningful way. My Two-Rock effortlessly got classic rock Marshall guitar sound through this cab. The cab had that perfect low end 'schwooziness' (I just made that word up, but if you think of certain Hendrix records you know that sound) and the cone breakup in the midrange, and the lovely high end...the whole thing was just perfect to tape with an older PRS and what we were recording. I would NEVER have tried this combination absent this emergency, but it turned out to be a more than terrific matchup. It was, in a word, awesome. So much so that if I hadn't vowed never to record anything or set foot in a studio again, ever, I would be looking for one of these old cabs loaded with the vintage Greenbacks. If you have a TR head...and you want a pleasant surprise...try out an old Marshall cab with it. Don't just stick with what RF uses for speakers!