wrote in message
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I have an old Fostex that I want to use on a temporary
basis for some live mixing applications in a small room.
It doesn't have any balanced outs, and the stereo and
monitor outs are just RCAs. So if I want to send the
signal 40 or 50 feet, what's the easiest way to do that?

A 50 foot cable with RCA's at both ends.

Usually off-the-shelf cables are only 20 or 25 feet long, but standard cable
joiners work, tape 'em up if they tend to pull apart.

As Mike suggests, you might have to pay attention to how you route the cable
to avoid picking up hum.

If you can get away with plain wire in an application like this, it will
probably sound better than transformers unless you drop big bucks on the
transformers.