The PHILCO Phorum
Speaker cone repair - Printable Version

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Speaker cone repair - Tom Ferguson - 03-26-2021

Good afternoon, gentlemen

I have a small tear in a speaker. I see several ads for black rubber cement for cone repair, but the writeups always talk about replacing the whole cone. That doesn't seem necessary. Shouldn't I be able to repair a small tear? This tear is about 1/8 to 1/3 of an inch long on both sides of a right angle. Otherwise the cone is perfect.

Is that what you guys use, or have you learned there is something better? Or <Gasp! choke!> do you recommend replacing the whole cone? It's a 12" off my Philco 41-285. 

Thanks in advance.

Tom

RE: Speaker cone repair - morzh - 03-26-2021

Small tear is repaired with rubber cement.
I use it and most people do. It would seem inexpedient replacing a whole cone due to a small tear.
Apply it from both sides, more that one layer. Not too thick,

RE: Speaker cone repair - Paul Philco322 - 03-26-2021

Have also used the cement and a patch like coffee filter as well to secure.......

Paul

RE: Speaker cone repair - Allen in SB - 03-26-2021

Rather than rubber cement, I prefer the method described in this link:

https://philcoradio.com/library/index.php/shop-talk/syls-restoration-topics/1-fix-for-torn-speaker-cones/

Good luck,

Allen

RE: Speaker cone repair - Arran - 03-27-2021

General purpose contact cement works well, goes on thin, remains flexible.
Regards
Arran

RE: Speaker cone repair - David - 03-27-2021

Have had good luck with rubber cement for small repairs. larger repairs small pieces of coffee filter soaked in Elmers white glue or kids school glue.

RE: Speaker cone repair - mikethedruid - 03-27-2021

I use black RTV and paper towel. The RTV turns into actual rubber when cured. I spread a thin amount on the cone around the whole damaged area, being careful to brace things from the other side so as not to increase the damage. I spread a thin amount on one side of the paper towel patch cut large enough to cover the entire damaged area with about 1/4 inch on each side beyond. I then put on the patch, RTV side to RTV side, and carefully press it into place, again, providing support from the opposite side of the cone. Let it dry over night and you have a good, strong repair. You could use a coffee filter instead of the paper towel, but, since I drink instant coffee, and don't use coffee filters, I use what I have.

RE: Speaker cone repair - Paul Philco322 - 03-27-2021

My dad liked Instant, though he aslo used a MIRRO aluminum pot on the gas stove with Maxwell House ground that would make your hair curl, evaporated milk and 1 sugar.....has nothing to do with speakers.


Paul

RE: Speaker cone repair - RodB - 03-28-2021

Here's my take, and the way I do it. The cone is stiff so it can move the air around it. I make cone repair with a paper using acid neutral glue. I have repaired the cone surround with a flexible layer of contact cement that stays flexible so the cone can move freely. This produces a mellow tone as the bass notes are better quality.