Wow! A picture worth far fewer than a thousand words. Do you KNOW it's ETC and, if so, how?
I assume that is based on the ETC logo on the lower left corner of the control panel...but I'm no mind reader.
Oh I’m a liar - it could also be an AAS as stated earlier.
They're looking to upgrade, but so far everything I see in their photos is circa 1982. The current system has two sets of track lights connected to the dimming system. I head up there in two weeks to take a closer look.If it's DAS, then L86 or other similar vintage dimmers are indeed likely. AAS persisted for a surprisingly long time as the "basic" option when a full Unison architectural controller would have been overkill, so the dimmers may be more modern. Either way you'll need a little more sleuthing to know for sure what that panel is controlling.
Are they having problems with the existing system, or just looking at upgrades?
Yup, and I know of a local high school that had AAS installed with a Sensor rack around 2002. That was something of an emergency fix after the previous Electro Controls dimmers let the smoke out, so nothing else in the system was upgraded at the time. My memory is a little fuzzy, but I want to say that AAS didn't fully go away until CEM+ added the ability to do basic preset stations.
I would say take the station off the wall and take a pic at the wiring running to it - that will tell you if it is DAS - in my experience as service tech back then it most likely runs to an EMAP ( control processor ) mounted in a beige box probably on the wall next to the dimmer rack ( could be L 86 - look for a big black monster ) or could be early sensor .
ETC's datasheet for DAS ("Digital Address System") mentions the availability of slider stations in addition to pushbutton stations, and has a picture or two of examples. Quite possibly they were none to popular.The DAS had buttons (snapshots), no faders -- hence the Digital Architectural Controller.