Just wondered if anyone is familiar with these old radios. The red "lock" led should normally be on, until the wadley loop system is tuned in, locked, and then the led should go out. It kind of works the opposite way you would think it would. My problem is that now, the led is permanently out, the unit is totally out of whack, and receives nothing. This only happened since we got into the warm weather, so suspect the fault is temp related. To confirm this I'll cool the set down in a spare refrigerator and see what happens. Just curious if anyone has come across the above problem before, and could point me in the right direction. Have a schematic diagram. Thanks for reading.