I just received an Allied/Radio Shack SX-190 and despite needing a little TLC it is in really nice condition. I've removed the covers and nothing has been touched. Nice to see that on an old rig for a change. I suspect filter caps (although there is no hum in the audio) and an alignment may be required as it is pretty deaf. Calibrators run but no signals from the outside world. The one thing it IS doing is giving me a little bit of a buzz when I touch the chassis. Just enough to know its there. I've not dug into t he schematic yet but I suspect it is related to having the 2-wire AC plug and the cap and resistor to ground on one side of the power transformer. What are things to look for? Any options to convert to a 3-wire plug? Thanks.