[Phono-L] Edison S-19-SM - reproducer gaskets

[Bruce Mercer]

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.