[Eric Adams]

Hi Guys,

I've got a strange one. On AM, It works great until I tune 720 or below. It cuts out and crackles like the plates are rubbing, but they're not. I have cleaned and cleaned. I even ran some heavy paper(business card) between every plate-more than once. If I switch to SW or FM, I get no noise at all up and down the dial. I thought that the cap tunes all bands  
Any ideas where to look?

BTW, When I finished the chassis I had no problem. This came on after a few months of listening.
http://www.nostalgiaair.org/Resources/637/M0013637.htm
Thanks,