[Phlogiston]

My Panatrope has some hum in the phono position. As I recall the signal lead has no shielding. I got rid of most of it by repositioning the bundle going to the radio/phono switch AND replacing the 227 audio driver tube from one that was very high testing to a somewhat lesser one. You are going to get more hum if you touch that switch. If you really wanted to get rid if it, a redesign of the cabling with shielded wire would probably help, but I would not do that.

Another thing, the pick-up (magnetic) has become much less sensitive. This requires the volume to be set higher. I rebuilt mine, and many others by replacing the rubber mounts (inside the magnet structure) and repolarizing the magnet its self. This probably tripled the level allowing the volume control to be set lower resulting in less hum.