In case you missed it in another thread, I'm looking for a used Comrex line extender LX-T or I believe they may have made one with the model number LX-TR. This was the small unit that extended a pots line response by taking some of the high end of the bandwith and embedding the low end in it later to reconstruct the low end at a lower limit. Anyone have one of these back on a shelf and would want to part with it?