Somewhere, I read about a problem occurring when the Icom IC-751A external antenna input is overloaded with too large a signal, thereby damaging the radio. The scenario is when there is a separate receive antenna that is too close to the transmit antenna, especially with an external linear amp feeding the tx antenna. I've searched eHam, QRZ, Google, and Bing until I'm sick if it, and I just cannot find it. I know I've read a post somewhere, which included comments by W8JI that back-to-back diodes across the RX input were insufficient to prevent damage to the radio (a relay opening the RX input was required), but I just can't find this anywhere. Can you please help me find that thread? Also, I have a chance to buy an IC-765 and am wondering if that radio has the same issues.