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AR XA counterweight

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Posted on July 4, 2016 at 13:15:49
dee eye why
Audiophile

Posts: 1148
Location: so. ohio
Joined: March 20, 2003
 Could the owner of an AR XA please measure the diameter and length of the tonearm counterweight so I can make a replacement? I would also need the distance from one end to the set screw. I picked up a decent XA for $40.00 but it is missing the headshell and counterweight. I am going to buy one of the 3-D printed headshells on Ebay and can easily make the counterweight if I can get the proper dimensions.
T.I.A.
Gary


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Freak out...Far out...In out....

 

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RE: AR XA counterweight, posted on July 4, 2016 at 15:19:02
M3 lover
Audiophile

Posts: 6604
Location: SW Mich
Joined: May 29, 2005
Contributor
  Since: July 4, 2007
 Gary,

The original CW I have from a parts box is D=27.8 mm and L=21.8mm.

I assume you've seen photos so know it is dropped, not centered?

Since it is best to keep the weight as close to the pivot point as possible have you considered increasing the diameter while reducing the length? I don't know the original weight and don't have a means to accurately weigh the one I have. Unless of course you want it to appear original.

The AR-XA can still be a wonderful unit once restored, good luck.

"The secret of life is honesty and fair dealing, if you can fake that you've got it made." Groucho

 

RE: AR XA counterweight, posted on July 4, 2016 at 19:20:36
dee eye why
Audiophile

Posts: 1148
Location: so. ohio
Joined: March 20, 2003
 A larger diameter and shorter length is a good idea. I can calculate the weight at onlinemetals.com. They have a great calculator that lets you choose the material and dimensions and then gives you the weight. I can futz with the dimensions to maintain the same weight.
Thanks for the info.


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Freak out...Far out...In out....

 

RE: AR XA counterweight, posted on July 5, 2016 at 05:56:38
mark.korda@myfairpoint.net
Audiophile

Posts: 1253
Location: Maine
Joined: August 16, 2011
 Hi Dee Eye, I have an extra counterweight for the AR-XA. I have to go to a painting job but will be home around 7.30 EST today. Give me a call, Mark Korda 207-632-1648..... I bought a new headshell from Ebay and it's really worth it. I'll dig up the paperwork to see if we have the same seller.(kordamark@gmail.com)

 

RE: AR XA counterweight, posted on July 5, 2016 at 07:03:48
briggs
Audiophile

Posts: 1674
Location: Connecticut
Joined: April 16, 2002
 I would stay with the original dimensions, materials, etc. I am sure they were well thought out.

 

RE: AR XA counterweight, posted on July 5, 2016 at 10:20:28
M3 lover
Audiophile

Posts: 6604
Location: SW Mich
Joined: May 29, 2005
Contributor
  Since: July 4, 2007
 Yes, no doubt they were "well thought out" at the time they were designed (actually I believe they were ahead of their time). But that was around 1961 and a few things have been learned about turntable and arm design since then. ;^)

"The secret of life is honesty and fair dealing, if you can fake that you've got it made." Groucho

 

I think the reasoning is..., posted on July 5, 2016 at 12:23:18
Lee of Omaha
Dealer

Posts: 1800
Location: Omaha NE
Joined: September 8, 2006
 that moving the weight toward the center of pivot decreases the force necessary to accelerate the arm toward the center of the record (1/m^2) while the weight will have to increase by (1/radius), so while the weight will have to be heavier, there's a net decrease in radial inertia.

So radially there's decreased effective mass while maintaining a fixed effective vertical mass (no acceleration in the vertical axis).

Have I got that right?

 

RE: AR XA counterweight, posted on July 6, 2016 at 03:33:09
dee eye why
Audiophile

Posts: 1148
Location: so. ohio
Joined: March 20, 2003
 Mark,
Shoot me an email through AA with your address. I found something in my stash that you may get a kick out of.
Thanks again for the counterweight.


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Freak out...Far out...In out....

 

RE: AR XA counterweight, posted on July 6, 2016 at 15:21:16
mark.korda@myfairpoint.net
Audiophile

Posts: 1253
Location: Maine
Joined: August 16, 2011
 Hi Gary, I got a nice brass one in the mail. The slip from the Post Office says Saturday for delivery.# (9500 1161 3692 6188 0028 44). The number for info is 1-800-ASK USPS.
I lost your phone number. Here is my address;
Mark Korda, 27 Goosefare Dr., Old Orchard Beach, Me. 04064....(kordamark@gmail.com)(207-632-1648)...Thanks Gary, it was good talking with you, Mark.

 

RE: AR XA counterweight, posted on July 9, 2016 at 06:47:26
mark.korda@myfairpoint.net
Audiophile

Posts: 1253
Location: Maine
Joined: August 16, 2011
 Hi Gary, when I sent your package I can't recall if I wrote Brookledge or Brookridge. The number for info is 1-800-222-1811. If they send it back I'll send it right back, but with a phone call today I hope a delivery can be made. Here's the tracking number again (9500 1161 3692 6188 0028 441). I have to go paint a room for an old gal so I can't do the tracking right now.....Mark Korda 207-632-1648

 

???!!!, posted on July 9, 2016 at 08:44:58
Kal Rubinson
Reviewer

Posts: 12436
Location: New York
Joined: June 5, 2002
 You guys should have taken this to private email rather than post personal information on a public forum. Too late for this time.

 

RE: ???!!!, posted on July 9, 2016 at 13:44:23
mark.korda@myfairpoint.net
Audiophile

Posts: 1253
Location: Maine
Joined: August 16, 2011
 Hi Kal, Unlike Hillary Clinton I have nothing to hide....Mark.

 

RE: ???!!!, posted on July 9, 2016 at 18:09:13
Kal Rubinson
Reviewer

Posts: 12436
Location: New York
Joined: June 5, 2002
 I believe you but there are folks out there who would take advantage of the unguarded. Just offering the suggestion.

 

RE: ???!!!, posted on July 9, 2016 at 20:43:28
mark.korda@myfairpoint.net
Audiophile

Posts: 1253
Location: Maine
Joined: August 16, 2011
 Thanks Kal your right. Next time I'll be more careful. I may have fumbled the right address and I didn't want to keep someone waiting if it gets returned to me. Good tip Kal...Mark.

 

RE: ???!!!, posted on July 13, 2016 at 17:09:47
mark.korda@myfairpoint.net
Audiophile

Posts: 1253
Location: Maine
Joined: August 16, 2011
 Dee Eye, I sent you an email thru the Asylum. I just want to know if you got the counter weight. I tracked it and can tell you where they left it if there was a problem.
I got your parcel.....trading is like a box of chocolates, and it's fun! Give me a call or email if you can.....thanks Mark Korda......I could not find your number on my phone. It's a dumb phone.

 

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