I recently aquired an older analog StrandCD80dimmer pack (24 channel)
and instead of converting it to DMX (expensive!) I saw Behringers Eurolight board has analog out control, via D sub 15 pin.
Would this work with the 0-10vdc 25 pin input on the Stranddimmer?
Analog control requires, minimally, one wire per dimmer plus one additional conductor as a common. Given a male 15pin and a female 25 pin and skill with a soldering iron, one couldbuild an adapter that 1) only used 12 of the 24 dimmers or 2) controlled the dimmers in pairs. A better option would be a console that outputs DMX, and a DMX-to-Analog or DMX-to-AMX converter. See DIY DMX: Demux, Protocol Converters, etc..
yes that is an option, but they cost ; )
What about this - the CD80 has AMUX i/o, would the 15 pin analog out from the behringer desk convert to that protocol?
Nope, AMUX which became AMX from what I recall is closer to DMX then to 0-10v. You can buy DMX to AMX converters. That would be the preferred way to get into the dimmers.