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Original Message
RE: New A7s! Need advice.
Posted by je2a3 on December 23, 2016 at 20:20:08:
I wouldn't worry too much about the cosmetic difference between the two drivers. They came from different production batches but essentially the two motor units are the same. However, the diaphragms fitted need to be identical. You can access the diaphragms by removing the three screws of the back cover. Just be careful with this operation since diaphragms are fragile. Take photos of the diaphragm so that we can see what type they are.
For hifi use, aluminum diaphragms are considered to be the better option. Modern replacements built to the same standards as the original Altec are available from Great Plains Audio for about $100/shipped each.
Happy holidays!
JE