larryh wrote:Just wondering. On the European Machines list is the HMV 101. I posted some photos of my Telefunken which seems to share the reproducer type at least as well as case.. I notice in this thread that all the machines have the metal Orthophonic looking reproducers, yet the 101 in the European Machines thread and mine have mica diaphragms.. Anyone know the history of how that went?
Larry
The HMV101 was produced from 1925 to 1931, during which time there were many changes in specification, but all versions had the No.4 soundbox with mica diaphragm.
By the time the HMV102 replaced the 101 in 1931, aluminium diaphragms had become the norm. The earliest 102's had the No.16 soundbox, which was superseded by the 5a and eventually the 5b. Many earlier 102's have a later soundbox fitted, as the No.16 was "sealed for life" and could not be repaired.
I have in my collection a 5b soundbox with a non-standard rear coupling to fit the the earlier narrow bore HMV tonearm of the 101 and it's contemporaries. Whether this was an approved period conversion or the work of an enthusiastic amateur I do not know.