[Guest]

I recently bought a nicely preserved 40-185 which promptly started right up after finding a missing 7C6 tube. The tuning seems a bit funny and I'm at a bit of a loss as to why. This model has a dial as well as pre set push buttons, all of which work well. It also has 3 bands, AM, SW, and Police. If I nutralize the push buttons, I'm assuming that the dial then becomes active. However, when the knob is turned, all I hear is the typical buzzing from power lines etc (not confused with the capacitor's humming if they are bad) and no stations. If I use the presets, the 1st 2 buttons give a few local channels loud and clear. The tuner turns freely and touching the antenna connections changes the level/loudness of the AM static, but no stations. Could someone explain how the presets work VS the dial tuner, and hopefully why the presets work but the tuner doesn't.
Any and all help is appreciated!

Jim