Wow! That looks great and is one heck of a deal! Congrats! Looking forward to seeing the new thread. It was based on signal reports from other stations. As soon as I got the reports, since the radio was nice and cool, I automatically assumed line voltage drop would be the most likely problem. The next thing I would have looked for was SWR (bad antenna ground, etc.). Going back a bit more than 20 years ago, I worked in radiotelegraph. RFI is most frequently caused by either proximity to the antenna being too close, bad RF shielding on the transmission line or improper output grounding. That is not exclusive, but frequent.