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Official AR Turntable Owners Thread

Just got my chassis back from @sfrost after he added mass and upgraded the springs. The bounce is much more controlled and I’m loving the sound. I added an AT6006a tonearm safety riser as well. Just waiting on my cork/rubber mat to arrive and I think I’m done. Really impressed with this turntable, it’s giving my Sota Sapphire a run for its money.
 

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Stuart B, please call me. I'm in Cols. right now and will probably leave here Saturday morning. I'd love to get my junk from you. I think you have my number. If you don't, msg. me.
Bob Schroeder
Thanks much.
 
Hi Bob, I've texted your phone number that I have. Stuart did get back to me said to have you text or e-mail him or use the AK conversation.
I'll send you a new conversation and include Stuart.
 
Sorry if this has been posted elsewhere, but I could not find via a search.

I came across an Acoustic Research turntable cartridge mounting guide with standoff information for some common cartridges at the time (came from a table that dates to ~1970).

I found a thread on AK that lists each standoff size (#1 - .05", #2 = .1", #3 = .15" ). I think it's awesome that AR recommended the use of a penny for additional headshell weight
:)

Screenshot 2025-09-20 071323.png
 
Hello Everyone,

I need some help please. I received an AR -Xa turntable in great condition however it is missing one of the tone arm pivot screws. These are the tiny pointed screws that are at the rear of the arm that the arm rides on when it is lifted.

I couldn’t believe it because all parts are here except one of these are missing. Any help finding one of these would be greatly appreciated.

Thank you so much!

Ron
 
Hello Everyone,

I need some help please. I received an AR -Xa turntable in great condition however it is missing one of the tone arm pivot screws. These are the tiny pointed screws that are at the rear of the arm that the arm rides on when it is lifted.

I couldn’t believe it because all parts are here except one of these are missing. Any help finding one of these would be greatly appreciated.

Thank you so much!

Ron
Sending a conversation
 
Has anyone developed an easy method for mass loading? Have done all mods except this. Hoping someone has a process and material list developed without having to melt and shape lead.

Edit: just saw the recent notes about the new VN springs so may go that route if there’s no lazy man’s mass loading.
 
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Has anyone developed an easy method for mass loading? Have done all mods except this. Hoping someone has a process and material list developed without having to melt and shape lead.

Edit: just saw the recent notes about the new VN springs so may go that route if there’s no lazy man’s mass loading.

Disclaimer: I'm no authority and am regurgitating my understanding of AR lore scattered here on AK k- under the lens of my going thru this process myself at this time.

I *just* received VN's springs (a few weeks back); and they definitely do need some work - out of the box, they don't compress to the same heights and the t-bar wiggles around like a Jello from those good old Tom-n-Jerry toons.

Easy depends on your definition of "easy" - I saw early pictures of T-bars with wheelweights stuck onto them; all the way up to later pictures of lead pucks + delrin "spacer plates" (I think Hose calls them 'collectors' :) ). You can gather all the methodology just by reading this tread. Ease depends on your tooling :) I'd say at a minimum you'll need some ways to drill metal, and, ideally, to cut plastic (jigsaw; bandsaw; scrollsaw...). Basic measurement, leveling equipment, and flat surface (kitchen countertop if stone) are also desirable.

You can forego lead. Wheelweights aren't lead nowadays if you're using a simple WW method. I heard that sticky fails on them. You can devise a method of not relying just on sticky (basic "wrap" around the t-bar with some flat twine will be a perfect redneck way of double-attaching them).

In my AR TTT, I will be using brass (I know, I know, this is expensive as heck but I don't want to deal with lead either - because I don't know the precise weight to add, doing it the first time, and don't want to shave off the lead; and used that as an excuse to by a 12x1x2 bar :)) attached to a Delrin "collector" plate, as seen here, for example: https://audiokarma.org/forums/index...-turntable-owners-thread.595003/post-16558673

Ultimately, what you're trying to do is get the springs to be equally compressed (30-32 mm for Linn springs) and the "jounce" to be in up/down direction only. From what I gathered (and understand on the redneck mechanic level), you want the weight to be as low as possible - the overall CG should be below the tops of the springs to prevent them from "tipping".

Though, putting weight too high (== simple wheelweights glued to the t-bar) is better than un-tuned springs.
 
Has anyone developed an easy method for mass loading? Have done all mods except this. Hoping someone has a process and material list developed without having to melt and shape lead.

Edit: just saw the recent notes about the new VN springs so may go that route if there’s no lazy man’s mass loading.
Hello!
Not sure how much I can be of help with this. Hopefully I can add a bit of insight. There are definitely others who can add from their own experience. I only have what @StuartB and I learned from the time we spent with Marc. God rest his soul. I had hoped to pour some lead "biscuits" for the mass loading. Marc moved to the thinner biscuit forms versus the thicker puck shape that were thicker and pushed the limit of the 3" plinth. Like I said others may have information that can be added. My understanding is the original AR springs could have lost some of their springyness (my word). Vinyl Nirvana does market their springs and my understanding were designed to no need additional weight and there have been good responses, I am not the person that can make a judgement. The extra weight may have been needed due to the stronger Linn Sondek springs that Marc used.
Adding the weight isn't just a process of gluing the weight to the bottom of the T-bar, Marc did set up a jig to put the collector plate, weight, and all the other components on the T-bar and moved the weight around until everything balanced, he used a couple of radial levels to get to their placement. Rotating the springs also was implemented. Nuts on the studs were minimally used to adjust the height. Tightened too much and all you are doing is taking the springing action out of the springs.
The weights of the lead forms on the cross bars were different than the weight at the end of the vertical part of the T. I do have the numbers in my notes and do have a set of weights to make. Just adding the wight in whatever form could make the jounce really sloppy.
The other hardware for the studs etc. can be purchased from a hardware store and to some degree are modified.
As for easy method once all materials are gathered it can all be assembled in one afternoon.
Personally if I am going to do this I will used the method learned from Marc. In fact I do have an XA that Marc did the arm that I need to finish and put into a mesquite plinth.
Do exercise patience.
Melting the lead into forms is the part I would like to somehow streamline.
 
I just acquired my first AR to my collection (complete except missing the two pivot screws) and i am keen to make it sing.
I came here looking for Marc Morin, having read great things on other forums but i see he has moved on to the greater universe.
The milky way is the ultimate vintage turntable.

Where/who is carrying on his work/upgrade knowledge? A data base or web site?
I am reading this thread but it is 300 pages long.
I am moderately adept at working on some equipment, i have many Dual tables. I live Alaska so shipping costs are prohibitive.

I look forward to learning more, thanks to all.
AR gurus?
 
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The two AR-XA/XB tonearm pivot screws are conical point set screws. I believe the thread is 5-40 (don't hold me to that).

Try McMaster-Carr or Fastenal, for example. (Or first try a WTB listing in Barter Town. Someone here might have some spares.)
 
Hi, Busy with projects including motorcycle riding classes. I have some tables that can be regarded as donor tables and should include sets of pivot pins.
I'll reach out to Ivan and Ron in a pm. Talk soon!

Edit: or feel free to reach out to me
 
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