I know we have discussed this many times before, but I just want to make sure before I encourage my venue to spend any money. We have a ClearCom system, circa 1995. We use RS-501 beltpacks, and I'm in a position where I could use a few more (at minimum). Unfortunately, there is no budget for this (is there ever?) and even the old, crusty 501's are between $100-150 on eBay. But I found some old-stock RS-100's that really intrigue me (and the price is a little better). I could use those for our followspot loft and free up some 501's for other uses. I've read here that the RS-100 is compatible with Series 500 systems, but I guess I just kinda want to hear it again. While we are at it, any other recommendations for compatible beltpacks? PPS: I have one RS-501 that is totally dead, but no obvious signs of internal failure. Is there anything common I should be looking for?