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FDP Forum / Fender Amps: Vintage (before 1985) / is it a waste of money to recone a vintage Jensen speaker?



Aug 22nd, 2019 10:26 AM   Edit   Profile  

I've got a couple old Jensen C12s that need to be reconed. My question is once you've reconed a speaker, don't you now have a brand new speaker with an old magnet? Will the tone of your newly reconed C12 bare any resemblance to the tone of an original cone C12?
Since they have to change the voice coil to recone it, how can there be any similarity between a reconed vintage speaker and a vintage speaker with the original cone?
thank you

Doc Sarvis
Contributing Member

USA/Salt Lake City

Tuned Strings and Tight Lines
Aug 23rd, 2019 07:33 PM   Edit   Profile  

I would have them re-coned in a heartbeat. Vintage cones can still be had in that size or there are great facsimiles. The ceramic magnets would have had to be exposed to another magnetic source to lose significant strength.

Someone is always looking for original speakers, original and re-coned, so, working or not working, give someone a chance to use them.


usa Thumb area Mi

Aug 23rd, 2019 07:48 PM   Edit   Profile  

re-cone them.

After a couple of years, they will start to emulate their former self.

I believe it’s the combination of the type of cone, surround doping, and strength of the driver And... Father Time that makes a great Jensen (as we know them today)

Back then there was no "Magic Dope" No Secret Lost art of applying it to the surround, No Fairy dust that got sprinkled on the cone, No lost textiles that made up the spider. No prewar magnets void of radiated molecular atoms etc.

Voice coils and formers ... pretty straight forward stuff.
Kapton voice coils sound no different than paper (been proven to the point it's absurd to mention this)

So what makes a vintage Jensen sound so good?

I’m convinced it’s all "Father Time" working his mojo on the surround and the cone fibers. No two 60yrs + Jensens have the same resonance frequency. As speaker ages, the RF drops naturally and mellows the speaker. I think any variation of the American multi-ribbed cone add aging (stress on the surround + cone fatigue) is the factor. I’ve got a pair of late 60s or early 70 Oxford 12T6s that sound awesome. combine that variation of cone with a 30 oz magnet driver which tends to have a moderate natural break up .... the result creates a beautiful quality sound.

I have some Jensen Ri C12Ns (the reissue of the Chicago Jensen C12N C6969) that Father Time is working his mojo on.... they are doing the same thing. After 14yrs those RI dropped 5-10% in their resonance frequency and sound extremely close to vintage C12Ns I have several old Eminence Legend 1258s that are doing the same thing.

Re-cone them & put some miles on the surround and cone.. IMO They are going to sound great.

(This message was last edited by pcalu at 03:03 AM, Aug 24th, 2019)

Contributing Member

American Patriot

About as ordinary as you can get.
Aug 25th, 2019 12:57 PM   Edit   Profile  

Recone them for sure. Once the reconed speakers are broken in, they should sound close to the way they originally sounded.

(This message was last edited by BbendFender at 05:33 PM, Sep 7th, 2019)



Aug 26th, 2019 07:42 PM   Edit   Profile  

I usually don't recone any of the lower powered Jensen like: P12T, C12T, P12S, C12S or those real small alnico's found in low powered Gibson amps.

Contributing Member

If irritation occurs

discontinue use.
Sep 9th, 2019 06:27 PM   Edit   Profile  

The original paper type used in the cones is no longer made, so the speaker won't sound the same as it did when it was factory fresh. But that does not mean it's going to sound bad.

I always re-cone a blown speaker if the replacement cone is available. You can buy a complete kit for about $25 and do it yourself. Lots of good tutorials online.

FDP Forum / Fender Amps: Vintage (before 1985) / is it a waste of money to recone a vintage Jensen speaker?

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