In the first place gaskets in an Edison DD reproducer were cork not rubber.
It is extremely important that the diaphragm is air tight. Also make sure
that that that end of the linkage is tight as well. The brown material you
see is burnt shellac. That was used to seal the cone to the diaphragm and
over the ends of the tiny nut retaining the stylus cord. Using Pvc-E here
works fine as there is no shear motion and stays pliable unlike the burnt
shellac that is ridgid. The object again is to make it airtight. If you
REALLY want to tighten things up, install an O ring of perfect size as the
end of the reproducer. I tack mine on with Crazy glue. Now you have an
airtight chamber from diaphragm to tip of horn. If you don't believe the O
ring (air tightness) makes any difference (air tightness), take it out and
compare the difference. Air leakage is very detrimental in an acoustic
system.
Bruce
ps. remove and polish the rear weight bearing with silver polish, and
re-oil. This is often overlooked.
Assume that all old rubber gaskets need replacement. They are not there
to
make the diaphragm airtight BUT to act as vibration dampeners.
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