About 40-some years ago, I was a service tech at a TV/Stereo repair shop, and they took a contract as factory service for several very cheap brands of console stereos. I went out on a service call at an older lady's house (she was probably younger than I am now, it just occurred to me!). Her complaint was that the little red "Stereo" light would light on and off out when she was tuning through different FM stations. Had a hard time convincing her that the light wasn't broken.
Another -- Not a stereo story, but we were also service reps for a brand of built-in burglar alarm systems. They weren't designed with any consideration for RFI, and there was one installed in a house near to an FM radio station tower. Every morning when the station came on-air, it would set off the alarm. The manufacturer had us try this and that (capacitors across varying things) but of course we couldn't tell if we had fixed it till the next morning. Trial fixes went on for a few days. But one night, problem solved -- burglars broke in and stole, among other things, the main unit of the burglar alarm system.
Another -- Not a stereo story, but we were also service reps for a brand of built-in burglar alarm systems. They weren't designed with any consideration for RFI, and there was one installed in a house near to an FM radio station tower. Every morning when the station came on-air, it would set off the alarm. The manufacturer had us try this and that (capacitors across varying things) but of course we couldn't tell if we had fixed it till the next morning. Trial fixes went on for a few days. But one night, problem solved -- burglars broke in and stole, among other things, the main unit of the burglar alarm system.