12-14-2013, 05:22 PM
I think its a known mod based on this service bulletin:
[Image: https://dl.dropboxusercontent.com/u/54621529/37-10.jpg]
You can see the full bulletin in the 1937 section listed as "Changes: July 1937" http://www.audiophool.com/Philco.html
[Image: https://dl.dropboxusercontent.com/u/54621529/37-10.jpg]
You can see the full bulletin in the 1937 section listed as "Changes: July 1937" http://www.audiophool.com/Philco.html