On 02/18/16 00:16, Patrick Turner so wittily quipped:
I have a few things to say about AM radio, and generation of AM waves etc.....
http://www.turneraudio.com.au/Kitche...adio-2015.html
since you're using SS diode (1N914) you might as well use schottkey
diode instead since the forward bias is lower and more of a 'shelf' -
should improve low signal detection.
or you can bias the diode a bit... or use a tube with high Z which
should have ~0V forward bias at very very low currents (and no reverse
current at all).