THIS ITEM HAS BEEN SOLD.
I have a Radial Tonebone Switchbone AB-Y unit on eBay right now. I used this unit to switch between my RM100LB (Lynch box) and RM4. I recently sold my RM4 and so not longer need the Switchbone. I had actually used the Lynch box to power the RM4 so I was able to tap a total of 7 MTS modules, all powered by the Lynch box. This is a high end unit, not a cheap AB-Y box, there are no ground loop issues with this unit.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=250752423179&ssPageName=STRK:MESELX:IT
I have a Radial Tonebone Switchbone AB-Y unit on eBay right now. I used this unit to switch between my RM100LB (Lynch box) and RM4. I recently sold my RM4 and so not longer need the Switchbone. I had actually used the Lynch box to power the RM4 so I was able to tap a total of 7 MTS modules, all powered by the Lynch box. This is a high end unit, not a cheap AB-Y box, there are no ground loop issues with this unit.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=250752423179&ssPageName=STRK:MESELX:IT