SW4ever wrote:

Icom R9500 operating manual, almost 150 pages,available as a PDF file
at: http://www.radioworld.ca
Jan. 2008 QST ran a product review, and astonishing AM sensitivities
were shown, as follows:
At 1 MHZ 2.8 microvolts Preamp Off
0.82 microvolts Preamp 1 On
0.52 microvolts Preamp 2 On
However some confusion arises with AM sensitivity shown as 6.3
microvolts from .01-1.8 Mhz, still impressive. This latter sounds more
like it, but if 1 Mhz figures above are right. what an awesome AM
broadcast receiever !!

I just grabbed the manual for the R8B and at least according to that it
certainly has better sensitivity than the R9500.