No, Luis, you've got it all wrong. The light source choice did not define 138 versus whatever, but the chassis style itself. The hybrid 138G chassis, with 184 dual lower column and 138 upper single column had nothing to do with point light sources or specialty micro work, but could be potentially used for any application where greater stability was needed. The one I could have does it for sake of a big colorhead, oversized baseboard, and greater cumulative height for sake of larger prints.. But just firm wall mounting will completely stabilize an all-single-column 138 at lesser height. Bellows style and lens mount (turret vs single-hole) were minor option differences which evolved over the decades of these things being produced. It's often hard to tell when a particular combination of features was sold that way from the factory, or jerry-rigged out of separate components by the user afterwards. All kinds of combinations were possible.
What you linked per the now defunct Durst USA options included a lot of things that Jens himself cobbled together, or at least claimed he was capable of doing; and this was not entirely a direct reflection of original factory offerings. Jens bought up all kinds of leftovers, not only from Durst, but even from individuals like me (I should know - he never did pay me !). Eventually, he had over twenty usable enlarger in stock, whether new crated units from Durst itself, still unsold by them after a couple decades, or numerous cobbled tweaks by himself for various applications (some equipped with UV printing heads). When he couldn't come up with enough components, heads, or carriers, he was a highly competent machinist and made his own replacements, and also bought out the parts and rights to the Condit corporation.
But anyone who ordered and prepaid for such components by themselves for self-installation risked getting stiffed. He claimed to have all kinds of things in stock that couldn't even be obtained any longer, and that he couldn't make. So toward the end, he did manage to sell all his complete enlargers. But what he was really after was the more lucrative mandatory service contracts with installation and travel expenses that he'd charge labs all over the world. I visited his actual facility when he was still in operation, spent nearly an entire day discussing Durst details and combing through his parts inventory. He certainly knew his products; too bad his business ethics were so flawed.
If you check out the Durst Museum site (I can't recall the specific link) there are some interesting huge dinosaurs in there, which don't show up on Jen's brochure.
Baloney Drew! If you would bother to read what others write before running off at the keyboard, I pretty clearly said that there was the L-139G which was a single post upper with the L-183 base with the 5x7 camera. The G 139 was typically supplied with the point light source. With regards to my photo, I said that mine is an SM-183 with the 138S camera, so I'm not that familiar with differences with the chassis. IC posted a photo of the SM-183 above which is the same enlarger as the one in my photo except that mine has a CLS-301 head and the arm down, whereas the one IC posted has a condenser head with the arm up. You can't even get the name of the enlarger correctly, "The hybrid 138G chassis, with 184 dual lower column and 138 upper single column had nothing to do with point light sources..." There is no 138G chassis, if there is, please post a photo of one or the manual-but you never do, do you! The SM-183 was indeed designed for microfilm work, plus the Nega MC carrier that was supplied with it was to accept aperture cards without removing it from the enlarger. So you said that I referenced the Durst Pro USA which is now defunct, it may come to you as a surprise, but the enlarger division of Durst is defunct also!
"If you check out the Durst Museum site (I can't recall the specific link)", you never can recall, can you? Only innuendos.

