Yeah, I was experimenting a little, and wondered which I’d like better as a PI tube, so I put a JJ - 803s (?) in. It was a bit gainier than the NOS Brimar. Not much. Could’ve been that Brimar has a little lower output. On the HXDA, it’s a clone of the 60s Plexi Superbass that Duane Allman used for Live At The Fillmore (The Allman Brothers located the actual amp, and lent it to PRS, as they endorsed PRS amps). It progressively switches into a Hendrix style Plexi cloned from a 60s Superlead owned by Eric Johnson. Paul Smith said there were only a few parts differences, so the three HX/DA switches switch those parts into or out of the circuit. When I got the amp, the first thing I did was set the switches to DA and there it was - the tone on Live At The Fillmore, big as life, in MY room! I was totally blown away! It’s one of my all-time benchmark tones. Of course, it does more than that, as I later learned. As much as I loved my TRs - and they were fabulous amps that came equipped with NOS tubes Bill tested and installed - the HXDA suited my style of play a little more; was perfect for a big chunk of what I do. So happy as I was, I also dug the DG sound, and got that amp to have something different on tap for a more American vintage tone. Now I use the DG as much as the HXDA. I’ve had these amps since 2014, longest term amps I’ve had in 15 years, and still get all happy inside when I use them! I got the Lone Star because my son tours with one. At first I wasn’t happy with it, and mainly he plugged into it when he visited, but as I mentioned earlier, NOS tubes and some power tube damper rings improved it a lot (the power tubes rattled like crazy being so close to the speakers in a 100 Watt combo; I’ll never do another combo, but these weird tube damping rings were a last resort that one hundred percent just worked!). As an aside, I did one other looney thing, and tried the Essential Sound Music Cords (these are big diameter power cords) with the DG and Lone Star (the HXDA has a captive power cord). I know, it’s impossible snake oil that isn’t supposed to matter, but turned out that it mattered, so now in addition to the amps, everything in my studio that has an IEC power cord has one - main balanced studio power supply, powered monitors, preamps, converters, tube mic power supplies, synths, etc. - and the sound is noticeably better, especially the monitoring system where the imaging and bass accuracy is somehow improved. I’d tested expensive power cords in the past that were emperor’s new clothes items. This one worked, what can I say, except that I know it’s an eye-roller, but there it is.