The best AM section I've found in a tuner so far was, unfortunately, in one of the most expensive tuners out there as well. I won't go into full technical detail, but suffice to say the AM section in the Sansui TU-X1 with its synchronous AM detector is simply one of the very best ever produced. Reportedly, Carver also did a decent job with the AM section in their TX-11a and TX-11b as well, although I've never used one. I've also gotten good AM out of my Sony ST-S730ES which has selectable bandwidths, although it was by no means as good as the TU-X1, with its wide/narrow, selectable filters, and synchronous detector. The Philips AH673 also had a good AM section, reportedly. Sansui and Pioneer also put decent AM sections with selectable bandwidth in a few tuners, Pioneer specifically in the TX-7800 and TX-9800. The most economical might be the Carver, where I'd take a second look for sure. The lower end Pioneers and Sansuis don't seem to have had the filters often necessary for good wideband AM reception. Hope this helps.