05-20-2016, 11:06 AM
http://www.nostalgiaair.org/pagesbymodel...013333.pdf
Note that only one of the filter caps - side is connected to the chassis.The other two go back to the ct of the power transformer. If that is OK then try removing tube till the hum goes away. Removing the 84 will kill all sounds. You may have a bad tube with a grid to cathode short. Just for grins try disconnecting one side of 46 the cap across the field coil see if that helps.
Terry
Note that only one of the filter caps - side is connected to the chassis.The other two go back to the ct of the power transformer. If that is OK then try removing tube till the hum goes away. Removing the 84 will kill all sounds. You may have a bad tube with a grid to cathode short. Just for grins try disconnecting one side of 46 the cap across the field coil see if that helps.
Terry
