The earliest perfected phonograph used a Grenet cell however the Class M used a battery of 3 or 4 Leland cells.Chuck wrote:I'd like to see an Edison Class M machine
running from a real live Grenet wet cell.
A Grenet cell produces around 1.9 volts (up to 2.2 if you swish and agitate it). A Class M needs around 3.5 volts and many today take a little more to get them going properly.