restoration project on JBL 4310

[bikehomero]

Hi, my name is Jürgen and i'm new here since i've got a pair of old JBL 4310 monitors. They are driven by 2112, 2105 and LE20-1 so the later version.

Cases have dents, scratches and are crudly made. You can cee nailholes and poor paint application. One of the tweeters ist damadged, it has only 1,2Ohm.

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First the glued bezels from the bottom edge and the tweeter must be removed to reach the screws among them. I've used some heat and a sharp knife.

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[bikehomero]

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The naked cabinet:

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[bikehomero]

sandig and fillering:

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[bikehomero]

Primer:

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Paint, satin black:

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[macaroonie]

Welcome to these forums. You have made a good start , always nice to see competent restoration.

[martin2395]

Beautiful job Jurgen! I hope you can find a new LE20! I saw a pair on Dutch Marktplaats some time ago.

Was it only primeror was it a primer with "spachtelmasse" (putty) in it?

[bikehomero]

Yes Martin, it was a primer with putty. I've allready got a pair of LE20-1 :)

[martin2395]

Thanks for the answer, I have a pair of 4301 cabs in sad condition so that kind of primer should work wonders. I already repaired 4 completely chipped corners :(

[bikehomero]

Some work with the veneer:

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[bikehomero]

More veneer. 10x oiled with ever becomes finer sanding up to 600 grit:

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[SEAWOLF97]

I love well documented restore projects like this one. Always pickup up some tips
that can be useful later :)

the veneer looks like oak in some pics and like walnut in others ?

[bikehomero]

It's walnut.

[Odd]

Very nice job!

[bikehomero]

Know i'm ready with the woodwork of the first cabinet. The new LE20-1 has an impedance of 4,2Ohm, seems well. So i put the drivers in again to try it. L-Pads ar only treated with T-6, better cleaning will follow soon.

Works well!

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It know looks better than ever, evrything, including the baffleboard is supersmooth.

[martin2395]

Ah, smooth like baby buttcheeks? Nicely done!! :D

[bikehomero]

Martin, somoother :yes:







Test setup:

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[macaroonie]

E202 , I had one of those for 28years. Great amp. The speakers are super. :applaud:

[bikehomero]

Thank you! T-101 is on the way :D

But don't underestimate these wonderful Sonys. Including the SS-3100 it's an comlpete active setup.

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[martin2395]

These are GORGEOUS :drool:

I too had the TA-3200F! Almost McIntosh-like build quality.

[corvettedcg]

Beautiful work! Congratulations!

[bikehomero]

Thank You!

Missing woodwork on the second cabinet and L-Pad care. tbc

[Mr. Widget]

A bit off topic, but would you mind talking about the differences/similarities between the vintage Sony gear and that Accuphase amp?


Widget

[bikehomero]

The Sonys are a little bit older, they are from the early 70s. Phono adjustment at the TA-2000F is supermodern for that time, including MC options. In my case this is not important, because i use a Lundahl LL 1681 to fit my DL-103. The ability for active amping together with the TA-4300 is much more important to me. The SS-3100 sounds much better, active driven. 4310 sounds better with the E-202. I think the reason is the better damping factor of the Accuphase. Missing a test with active driven 4310 from the Sonys.

Sensitivity of both tuners in nearly the same. In comarison, the ST-5130 is a little bit sounded on the bassy side.

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4310 Prepared for active use:

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[bikehomero]

Oh, just noticed, there is no foto of the Accuphase tuner, i talked about. Here it is, a T-101:

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[martin2395]

These look nice!
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Not sure where you can buy them in the EU.

[fabrice11]

Very nice job :applaud:

[macaroonie]

These look nice!
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Not sure where you can buy them in the EU.

http://uk.mouser.com/Search/ProductDetail.aspx?qs=e4mSxZDfAPYQ4r2Cid8%2fRQ%3d% 3d

It's called barrier strip

[bikehomero]

Thank you! I will order some and switch them. What is the difference between "Open End Position" and "Throug Hole" in mounting style?