I am going to caution you against the 138. I have one and have never been able to get it working properly because it is impossible to find a decent light source. The original bulbs are a fortune and hard to find. I tried to build an LED replacement but I really don't know what I am doing. The only non-original bulbs that work are high wattage and extremely hot so you have to build some kind of ventilation system. Every bulb I tried, other than the 500 watt ones, had serious light drop-off. So unless you have some mechanical skills, the Durst could be a huge pain in the arse. Furthermore, any replacement parts or extra parts you might want usually cost a fortune. I am trying a few more solutions before I get rid of mine, but as it is, it just takes up space. I would love to find an Ilford VC head for it, but they don't come up very often. Now I contact print 5x7's and print 4x5 on a DeVere.
I can't believe that anyone would design an entire enlarger based on a particular bulb (which is now impossible to find)!
Good luck.
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