How to get 5.1 digital source into analog pre-amp

I used the MSB;sorry I can't remember the model #. This was thee swiss army knife of digital processors.Coax or toslinc in;--pcm-out--(It had a digital out that you could hook up to a 2ch dac.)---Like everybody says--old. I think near 10 years 'old'.
I think I had to have this msb, to get dts from lazer disk.
I think that was because my processor Citation 7.0 didn't have digital inputs---as I remember

Thank you all for the helpful responses. As is often the case I find myself amazed at what CAN'T be purchased despite a clear need.

My other recent experience with this was for something much more basic, but also unobtainable and (for me) very important: I have tight clearances near my power conditioner, so I was looking for a simple right angle adapter (NEMA male to NEMA female) to change the angle at which plugs would enter the power conditioner. Couldn't find them anywhere! Even at electrical supply houses. Sure I could find right angle power cords with cheap wires, but I just wanted the shortest possible route to do this.

I guess it's the old rules of supply and demand, but this hobby sure can be frustrating -- if I consistently have issues like this come up and my set-up is not particularly unusual, my guess is that a large portion of us have issues like this with some regularity. Maybe I'll post a new thread...

Thanks again.

--dan

outlaw audio 990 is a good sounding cheap 5.1 ch pre/processor for $1100 new or a bit less used. it is a large however. thats what I use to feed HT to my 2 chan. system.