I have Baumbach's book on the Columbia Disc machines, which is a great help, but it is still a murky swamp.
Lately, I've been curious about the various reproducers Columbia used on the Disc Graphophones and Grafonolas.
I'm familiar with the "Analyzing Reproducer", the ubiquitous No. 6, the "New Columbia", and from pictures, the Concert Grand.
The one that baffles me is the No. 5 reproducer. I see it mentioned in print, pictured in the rogues' gallery of Baumbach, but I cannot seem to find anything definitive about it on the interwebs.
When were they produced, what machines were they furnished with, how are they identified, what is the diameter on the diaphragm, how do they mount to the arm ?
Thanks !






