I had a little extra time this month, so I expanded the Yardeny Spot Tuner (C-131/AR) web page with a new link to a manual that I had scanned, and some information that came out of a little historical research. Here's the link for perhaps the two or three people on the planet who might be interested: https://aafradio.org/docs/C-131.html 73, - Mike KC4TOS