10-08-2012, 07:09 PM
Agree, if the hum bucker winding is wired backwards you will get more not less hum. Can't hurt to reverse it and have a listen. All those old sets had some hum regardless. You can beef up the filter capacitors a little bit (say 10%) and as said, make sure your output tubes are not gassy, but there will still be a little hum or more likely interference from modern devices that simply didn't exist way back when.