Does anyone know what the "radio on a chip" IC Sony uses in the M37W? I have a broken one in addition to my new one and both the main ICs have had the ID obliterated. I know they are proprietary but some of Sony's proprietary chips do have data sheets that are available unlike the IC themselves.
I replaced both the FM and AM IF filters in my M37W with better muRatas and am very impressed with the results. It's interesting that they use a dual coil ferrite antenna for MW. As Allen in Newfoundland has shown, these are great little radios. If anyone is interested in replacing the MW filter, there is an ebay dealer in Poland that sells the 2.2kHz muRata filters for 450kHz IFs. I have dealt with him and highly recommend him.
