11-01-2018, 12:52 PM
An "open" in either the volume or tone control can induce hum. In most cases this is caused by wear of the conductive strip and/or isolation of the wiper (contact). this is unfortunately rather common in late 30's Philco's and can be worsened by attempted cleaning of the control.
Yes, the volume can be affected.
Yes, the volume can be affected.