The pleats could be different. On the other hand I was also told about multiple designs that were implements over a very short time period.
Here is a picture comparing an American Columbia diaphragm in a 15A reproducer to the discussed type: http://img389.imageshack.us/my.php?image=8905lx6.jpg There are no attachment areas for any spider on that diaphragm. It is just the inner (thicker) dome which is bent through the outer diaphragm and is sealed on three spots with a drop of wax. At least this one should play way better than any available reproduction. Norman At 19:21 08.09.2008, you wrote: >That might work but it is not a Vivatonal diaphragm. It looks like it has >more pleats than the Vivatonal and I think I see attachment areas for a >Spider. > >Ron L
