The Talking Machine Forum — For All Antique Phonographs & Recordings

I am looking at rebuilding my Model C reproducer as it sounds a bit blasty. Should I use cork or rubber gaskets? Also, should I replace the original copper diaphragm or just reuse the original?

Rubber gaskets were original to the model C. The modern neoprene(?) replacements seem to be a bit harder.

I wonder whether anyone has tried silicone?

If the diaphragm is in good condition, I see no need to replace it.

Bill

Thanks.I had seen cork gaskets for the C and didn't know if they were any better. One last question. I had heard that the new rubber gaskets are thinner than the originals. Is this true, and if so, should I get two sets for the one reproducer.

Buy gaskets from Ron Sitko. They're only a few cents each and they're pretty good. My favorite ones to use are made by Bob Krapes and I buy them from Steve Medved. They are a little more expensive but it is totally worth it.

Rub the gaskets with graphite, that way they don't stick to the diaphragm. You don't want to clamp the retaining ring down superhard. You just want enough pressure to stop air leaks if you blow on the nipple gently. Make it too tight, and the diaphragm won't be able to vibrate effectively. Originally, the factory used paper gaskets to keep the diaphragm from sticking to the natural rubber gaskets. The ring was tightened just enough to keep the diaphragm from rattling, but allowing it to produce a broader frequency range. If you tighten it down too much the effect is much like turning the tone knob on an old radio up. Less bass and more upper mid range