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Since I had parts leftover after experimenting with magnetically suspended tonearms I build one more string suspended unipivot (no magnets in the bearing) with the intension of donating it to charity. To be more specific I want all proceeds to go to Greenpeace!!!
The bearing is my own idea. To my best knowledge this design doesn’t infringe on any patent so tonearm may be resold. I enjoy using two tonearms like it and I have absolutely no intention to make any more!
If it was a brand name tonearm I would go straight to AudiogoN, but this is a toy for special boys, that’s why I am showing it on forums first.
The tonearm is free standing; it only needs legroom on a turntable stand. It can be adjusted to work with turntable 5 to 7” high. Higher or lower TT would require rising tonearm or TT. Brass coupling discs for spikes are included (if someone wants to protect surface of the stand).
The wand is suspended in the middle of tensioned string in the way that string has solid contact with integral part of the wand, which allows effective drain of sound waves out of the wand, but suspension point is very small and acts as unipivot bearing. The Vectran fiber string is tensioned by a compressed spring.
Effective length is 305mm; overhang is 13.4mm, offset is 17.8 degrees. Effective mass is about 14g with aluminum plate or 18.5g with brass headshell plate. Extra counterweight is included. The tonearm does not have VTA on the fly adjustability. There are two separate antiskate mechanisms (twisted string and magnets) supplying different antiskate force at different part of LP. Proper setup is essential and not for beginners.
The wire and clips are Cardas, RCA plugs are Eichmann. The wire is not shielded - it may not work close to some motors etc. The tonearm lift is from VPI.
There are some details not visible on pictures: aluminum mounting ring is filled with lead; counter weigh shaft is filled with tungsten powder; counterweights are decupled from shaft with delrin inserts; wooden wand is pressure treated with oils, the bottom part of stand is made from acrylic, the top is rosewood; aluminum and brass parts are intentionally left uncoated and with time will loose shine…
I have to figure out how to organize the donation.
Mean time, if somebody wants to listen to this tonearm in my system I live in central Florida.
Any questions or suggestions?
Greetings,
Marek Stojek
Follow Ups:
Hi dudes,
I came back from a summer job and now have time to take care of this donation.
The ad is placed at the asylum classifieds. The price is $300 which is the costs of materials. The tonearm is not for beginners and proper setup is essential. That’s why it is offered to local members only, so they can try it before donating money to Greenpeace. I live near Ocala, Fl.
Marek
Super great work.
Being in charge of a local charity of one of Americas largest and most trusted charities, I would suggest that you 'sell' the tonearm and than donate the funds to your charity of choice. They also will give you a tax deductible receipt.
Can the buyer claim a tax deduction since I can’t use it? My income is too low.
Legally only the donor can claim the tax deduction.
nt
What I really like to stress is that the bearing of the tonearm (my own invention) works (and sounds!) better than conventional unipivot. Please read my post which contains most of the info on parameters, design details etc
I have a degree in material engineering and I am an amateur machinist with my own fairly simple workshop and a lathe.
The tonearm will have to be sold before the money goes to Greenpeace which might also bring attention to their cause.
It would make sense for the buyer to come and listen to the tonearm to my place in Florida since no refund will be possible after donation is made.
I have two other mechanically similar DIY tonearms that I’m not selling but if you’d like to see the pictures they are on audioproject.
Amazing work! Why not sell the arm yourself and donate the funds to Greenpeace? You'd be a much better salesman than a charity, which may not know a tonearm from a spindle bearing.
-Bob
As to donating proceeds to charity... feel free to email me privately through the Asylum email function.
What did you have in mind? You can email me now - I changed my profile setting.
The details are in my post with the pictures.
Marek- That's truly beautiful work, and I commend you on your choice of charities.
Kind Regards Ferd
Wish the charity was me. Truly beautiful work.
Wow, Marek, DIY?! You have real talent!
Wow, nice work! You obviously have a nice workshop along with design and fabrication skills. If I weren't about 2,500 miles from Florida, I'd come over and give it a listen. :-)
I was remiss in not mentioning the same thing. Awesome stuff.
Upload the first photo, do "Preview Message," upload the next, rinse and repeat.
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Just like that. Nice stuff, eh?
Wow! that is super nice.are you a engineer?It looks like you v the sskills and tools to make about anything.How does the set-up that you are not selling sound?
Dave
Yes, I do have an engineering degree, but I don’t work in my field.
All three DIY tonearms are mechanically similar and sound alike. They are part of my own system, which is listed in my profile. To me the sound is fantastic. It is natural, very clean, detailed, precise, holographic, dynamic, and consistent throughout the whole LP.
I compared VPI JMW-9, OL Encounter, two 9” DIY tonearms with Schroeder type of bearing (and with magnetic antiskate correction), and three (11, 12 and 13”) DIY tonearms with my own type of bearing. After hearing my tonearms, VPI was a bit muddy; OL was too edgy, especially for my high resolution system. The sound of magnetically suspended tonearms was excellent but I decided to make my own design with a longer wand.
I have not heard tonearms made by Schroeder, but after my experiments I believe mine bearing sounds a bit more dynamic, that’s all.
Marek
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