J-Corder Record Clamp

radio, tape, stands and accessories
ChrisfromRI
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J-Corder Record Clamp

Post by ChrisfromRI » 06 Aug 2019 06:29

I bought this overpriced J-Corder Record Clamp brand new from J-Corder (Jeff Jacobs' company in Washington State, which seems to be better known for tape recorder supplies) for $150. I thought it looked nicely machined out of heavy solid brass, and would work well with one of my turntables that has a lot of brass parts on it:

https://live.staticflickr.com/65535/481 ... 74c1_z.jpgBrass Clamp wit Chrisfromri Felt fix by c f, on Flickr

Unfortunately, it did not come with the felt bottom as shown. That was something I had to attach myself within the skinny rim machined into the brass base of the clamp to retain a rubber or felt bottom (otherwise only the skinny rim around its edge would contact the record label. Well, it turns out that was the least of my problems with this clamp.

Now it is complete junk because its inner spindle clamp broke after the fatigue of using it for two months.

https://live.staticflickr.com/65535/484 ... a98a_z.jpgBrass Spindle Clamp by c f, on Flickr

I immediately contacted J-Corder asking to BUY a replacement inner spindle clamp, not even asking for a warranty replacement. They replied: "Sorry we do not sell replacement parts for this piece." Shame they didn't complete the sentence: Sorry we do not sell replacement parts for this piece of junk.

Buyer Beware when it comes to buying anything from J-Corder! They have very poor customer support for their overpriced products!!

JDJX
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Re: J-Corder Record Clamp

Post by JDJX » 08 Aug 2019 22:23

Personally, I'm not a believer in record weights or clamps, although they might be useful with some warped LPs.

However, $150 for a weight? That gets a big WTF?

You can just get an inexpensive hockey puck . Drill a hole for the spindle. The, you can drill - a few holes on the top to insert some lead for the added weight that you want. i
I might not be as pretty as a $150 one but, you are saving about $150. :)

d4xycrq
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Re: J-Corder Record Clamp

Post by d4xycrq » 08 Aug 2019 23:00

Perhaps a silly question - does the record clamp well and truly need a clamp? Would not the weight of the "piece" do the intended trick?

I have brass stock and a metal lathe... But that brass is in a bigger than typical diameter.

Bob Dillon
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Re: J-Corder Record Clamp

Post by Bob Dillon » 09 Aug 2019 01:37

These aren't a whole lot more dosh than a hockey puck.. https://www.ebay.com/itm/GH-acoustics-r ... SwjtZbwECu

It's a weight not a clamp. Mine has been trouble free.

ChrisfromRI
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Re: J-Corder Record Clamp

Post by ChrisfromRI » 09 Aug 2019 05:00

My Oracle has a screw-down clamp and records sound a lot better with the clamp on it than not. My Goldmund was designed for use with a clamp and also sounds better with a clamp than without. They also each have their own dedicated clamps.

Both of those turntables have acrylic/plastic/metacrylic for their platters/mats. The clamps also flatten most warped records and are a lot less fussy than competing vacuum platter designs such as the SOTA, Micro Seiki, and Luxman. Using just a heavy weight may be as effective, but also may affect the main bearing.

Whether a record clamp works for you I believe has more to do with the specific record to platter interface than generalizations. I think they probably don't make a difference with certain setups, yet do with others. This is the same discussion with record mats, as some people can't hear a difference on their setup while others hear differences between mats.

This particular clamp was being used on a couple of my other turntables, including one that I built myself using a slightly concave acrylic platter. I could hear the difference with a clamp. Whether a hockey puck is as effective I don't know, maybe it is and maybe not. My hunch is not.

H. callahan
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Re: J-Corder Record Clamp

Post by H. callahan » 09 Aug 2019 07:16

d4xycrq wrote:
08 Aug 2019 23:00
Perhaps a silly question - does the record clamp well and truly need a clamp? Would not the weight of the "piece" do the intended trick?

I have brass stock and a metal lathe... But that brass is in a bigger than typical diameter.
The idea is to couple the record to the mat and to reduce warps. A weight does it by its weight, a clamp by being clamped. Therefore a clamp can be lighter than a weight and exert fewer load on the platter bearing.

Regarding the J-Corder they better made this part of aluminium, which is more flexible than brass and should last longer.

JDJX
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Re: J-Corder Record Clamp

Post by JDJX » 12 Aug 2019 13:30

BTW here is a past thread about weights etc... :)

https://www.vinylengine.com/turntable_f ... 1355&hilit

ChrisfromRI
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Re: J-Corder Record Clamp

Post by ChrisfromRI » 22 Aug 2019 08:41

I sent only the broken collet back to J-Corder who are forwarding it to their machine shop for failure analysis. They confirmed receipt and I'm looking forward to seeing how they resolve this. It's really a chance for them to shine...

cafe latte
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Re: J-Corder Record Clamp

Post by cafe latte » 22 Aug 2019 10:00

ChrisfromRI wrote:
06 Aug 2019 06:29
I bought this overpriced J-Corder Record Clamp brand new from J-Corder (Jeff Jacobs' company in Washington State, which seems to be better known for tape recorder supplies) for $150. I thought it looked nicely machined out of heavy solid brass, and would work well with one of my turntables that has a lot of brass parts on it:

https://live.staticflickr.com/65535/481 ... 74c1_z.jpgBrass Clamp wit Chrisfromri Felt fix by c f, on Flickr

Unfortunately, it did not come with the felt bottom as shown. That was something I had to attach myself within the skinny rim machined into the brass base of the clamp to retain a rubber or felt bottom (otherwise only the skinny rim around its edge would contact the record label. Well, it turns out that was the least of my problems with this clamp.

Now it is complete junk because its inner spindle clamp broke after the fatigue of using it for two months.

https://live.staticflickr.com/65535/484 ... a98a_z.jpgBrass Spindle Clamp by c f, on Flickr

I immediately contacted J-Corder asking to BUY a replacement inner spindle clamp, not even asking for a warranty replacement. They replied: "Sorry we do not sell replacement parts for this piece." Shame they didn't complete the sentence: Sorry we do not sell replacement parts for this piece of junk.

Buyer Beware when it comes to buying anything from J-Corder! They have very poor customer support for their overpriced products!!
I could probably make a replacement part, but if the rest is brass you don't need anymore clamping force. Actually extra weight on your turntable bearing is not a good idea at all. Kabusa sell a lightweight plastic one for this reason.
Chris

ChrisfromRI
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Re: J-Corder Record Clamp

Post by ChrisfromRI » 22 Aug 2019 10:25

I blue-printed the broken collet before I sent it, and I now have both a mini-lathe and a Delrin rod of the proper diameter, so I can make the replacement part myself if the manufacturer doesn't stand behind their product.

The turntable it's being used on is one that I built with a lot of brass parts, thus I was attracted to the brass record clamp to clamp the record firmly to the slightly concave machined acrylic platter. It has a sturdy main bearing plus the pulley system is designed to offset main bearing side-forces which is usually the bigger problem. The main shaft is hardened steel polished flat on the bottom and sitting on an extremely hard ceramic ball in the oil sump of the bearing. It is in a bath of 20 weight pure sythetic oil.

The dust cover is also home-made from a $24 piece of fluorescent blue tinted acrylic I bent on my acrylic bending table:
https://live.staticflickr.com/65535/482 ... 7648_h.jpgBlue Dust Cover by c f, on Flickr

https://www.youtube.com/watch?v=VoPkaT96k6E

ChrisfromRI
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Re: J-Corder Record Clamp

Post by ChrisfromRI » 16 Sep 2019 21:35

All is well that ends well - today I received a replacement collet back from J-Corder! Customer Service is Alive and Well!!

cafe latte
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Re: J-Corder Record Clamp

Post by cafe latte » 16 Sep 2019 22:09

ChrisfromRI wrote:
16 Sep 2019 21:35
All is well that ends well - today I received a replacement collet back from J-Corder! Customer Service is Alive and Well!!
Great news, slow though!!
Chris

AudioFeline
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Re: J-Corder Record Clamp

Post by AudioFeline » 07 Oct 2019 07:28

Why the turnaround - first they said that they don't have replacements, then they send you one? Did you mention that you had posted the story here?

That happened when my wife got the runaround by Sony after buying some cheap noise-cancelling headphones. They gave her the runaround honoring the warranty for months, until I told her I would post the story on audio websites. Within 30mins the Sony engineers had reassessed her phones and decided she could get the replacement she was entitled to under consumer law. They are now out of their warranty period, with little use, and don't work.

H. callahan
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Re: J-Corder Record Clamp

Post by H. callahan » 07 Oct 2019 14:41

Lol!

H. callahan
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Re: J-Corder Record Clamp

Post by H. callahan » 09 Oct 2019 05:09

(I meant "lol" because it only took 30 minutes to get replacement, not because the headphones no longer work now)

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