Just did some minor repair on the speaker of my 1939 Philco floor radio. The cats thought the cone would perform better with a few holes in it. I felt otherwise. By the way, if you ever need to replace a field-coil type speaker with a permanent magnet one....don't. The field coil is actually integral with the power supply...it acts as the filter choke. Quite a clever little circuit actually. If you do ABSOLUTELY need to replace the speaker, be sure to insert about a 10 Hy choke where the field winding was on the old one.