Hi Bahumbug - sorry if this is a bit of a late reply but after digging around I have found a transformer from a Beogram1800 which may just do the job. It is 240v 50hz with 12V output. I have checked the service manual on site for the Beogram 1700 but it isn't there although there is one for the 2200 & derivatives and these appear to use the same spec' tarnsformer.
If anyone knows any different then fair enough - I am only going by what is in the service manuals. You are welcome to it for the price of poatage to Oz. Gotta be better than risking £25 plus P&P on ebay
Chris.
The use of metaphors should be avoided like the plague. They're like a red rag to a bull to me.