12" DIY tonearm ala Schick for my SP10

[Magna Audio]

I've been a bt quiet lately - here's why...

I had been using a rather nice Acos (Pioneer PL-71) 9" arm.
When I bought the deck I tested a SME V12 - that was a tad expensive as nearly new and I though it sounded a bit to laid back and was probably not quite right for the Ortofon SPU Royal N I use.
Having looked at the Schick 12" I thought, could I build something like that to better what I have?

1st stop bearings - did some research, thanks to posters on wigwam bearing thread and I got me some Abec9 3,5 6mm spindle dia bearings to play with.

Let the project commence.

pics of the 3mm Abec9 bearings running in.
Bodged together rig to spin them and first suitable motor I could find...





Not bad photo's from a Nokia N97mini!

A quick test before running in (as they will work in the pivot) showed no discernible play - good start. Lets see if still ok after 50hrs+ of spinning.

The wand cut, bent supplied by redbeardanalogue - really nice guy - he included some silver arm wire too:^

I got a proper SME replacement arm / headshell socket / collar to fit the tube.

To get something 'long' up and running I intend to use a SME3009 armbase I have and mod the pivot to take my 3mm vertical bearings.

Then my own design on a brass base and pivot assembly could start. True to his word the wand has arrived from Jeremy and looks very good.

Here's some pics of the parts I assembled for the project.



idea of how it will sit.


Sort of insitu - Camera to hold up headshell end for photo





SME socket is nice fit.


One idea Jeremy had was to use heatshrink as damping for the arm - easy to take off again. I don't think I need to hide the SS arm as it looks pretty enough.
If it makes a difference then I might think about foam filling but let's see.

Off to the lathe.

"If anyone needs me I will be in my workshop - I am not be disturbed"

Spinning the nuts that clamp the centres of the bearings.


Twisted signal and earth - easy to push through. The twisting was Jeremy's recommendation.

Didn't have a grommet small enough so some duct tape in small strips is used to cushion the hole edge.
Coloured felt pen for red/green, white(no colour)/blue.


Important to heat shield the tags or you melt the plastic inside and the spring contact effect is gone! - Pal of mine has done that on his arm...


Tested and ready to go in


Socket in - nice tight fit and true


Action shots of hole cutting the base - 20mm


Based turned up


Then tapped the base for grub screw to lock the SME arm pivot tube and two holes in the base for screwing down.
Plus turned up a suitable (230gram) counterweight and tapped it for grubscrew to secure it to arm tube.
The weight was based on two ordinary weights hung on the back with the SPU / Sumiko on.

Placed on deck to see how it looks / check alignment


Close up of pivot - bearings epoxied on to SME pivot - incredibly strong - perhaps epoxy is not for the purist though!
Bit dusty too.


The business end


Can re-use the previous arm rest lash up for Acos arm, but in other armboard hole.

Still had the arm lift to sort out.


So at this point left to do:
-Remove armboard and drill mounting holes / thread & mount armbase.
-Solder up wires to phone sockets.
-Sort out a lift holder - preferably off top of SME arm pivot ala SME so that it moves up and down with VTA adjustment.

I did a quick check of VTA and it will be fine.
Also checked headshell level (azimuth) and that's ok.
Tried a common protractor I use and that aligned nicely. Of course it ran out way past the 240mm marks on pulling back towards rest;-) Well it would as the length pivot to base is 296.5m.

Figured out a cueing device from a Rega one I had 'in stock' so to speak. Bit of a lash up but it works and looks ok'ish.
More of a faff than building the arm tbh! These things always are.

Anyway. Mounted the arm did the last soldering - arm leads straight to phono sockets and then checked all measurements and alignments. All good.
Balanced her up at my SPU usual of 3g.

On with the amp - and cue up a record. Ah, no left channel.
Turned out it was the phono plug not quite home - bit fiddly with the plus under the deck you see.
That sorted - proper music.

Interesting - similar result to Pete's SME V12 I tried, which is saying something. Calmer, less what I can only describe on the 9" arm as colouration / distortion.

Quite a lot of bass and lovely cymbal character and shimmer I've not appreciated as much before. That was on
the ol' favourite - Armstrong and Ellington - Together album.
Ok on to some testing stuff - Tori Amos.
Lovely and expressive and again calmer - can listen at a volume that would have had a hint of setting my teeth on edge before I think. It's not quite as visceral as the 9" though.

Listening to other stuff I think the Sumiko heavyweight headshell is probable overkill or I could loose some mass off the back and slide the weight further out - decided to try that first...
Will also canvass for 'what headshell for my 12" arm' I think.
Wish I had the Techi one still to try as that was a bit lighter. I have the Pioneer PL-71 one but don't think the SPU will fit under it quite...

Anyway fun and games.

It definitely works well enough to be a keeper and refine.
Expect the Acos PL-71 arm to be back on the Pioneer PL-71 and on Ebay soon!



I then shaved about 1/6 off the counterweight depth and boy has it come alive!
When to stop shaving hehe?! Amazing what over massing the cart does!

This is really singing now! The bass is awesome - not just weight but detail and texture not heard before (and I rarely use that word awesome for risk of sounding like an amaricun - but where appropriate it is fine to use).

Now to get those big abec 9's bearings for the horizontal SME pivot, run them in and try them.

This has been a great project. Every bit as enjoyable as the Tannoy 15" Rect birch plywood cabs project and nice to do some metalwork after all the woodwork I've been doing.

[John]

Great work Steve
Looks good and more important sounds good as well

[aquapiranha]

That is brilliant! I sometimes wish I had a lathe, used to love messing about with all the kit in school and college, shapers, lathes, millers etc. My fave was the spark erosion tank...

Anyway, that looks brilliant, and goes to show people with talent and a little thought can do the same as most 'manufacturers' well done!

[Gdg]

Thank you for sharing with us this great job, Steve. That's why I love AOS

[DSJR]

Great looking arm - glad you're getting great results and apologies for the SPU mixup recently.....




P.S. I wonder if the arm-tube gent would consider a stainless steel 9" replacement SME tube (unless SME still sell them) and even better, a stainless steel "S" shaped techie pipe (I still think the Techie arm has potential..)

[Barry]

Wow! Well done Steve.

It looks really good, and from your description sounds good as well.

Thanks for sharing the photos with us.

Regards

[Marco]

Hi Steve,

Yet another brilliant D.I.Y project - and one dear to my heart too, as I love Schick arms, so well done! I'm glad that it's worked out so well

You are also so right about over-egging the mass with cartridges, and how things sing when you get it spot on - been there, done that, many times with the DL-103 and plenty of other cartridges, so I know just how significant the effect is of getting things right in that respect!

Would you consider making custom-made extra-heavy counterweight balances to order, made from brass, for the likes of tonearms such as the Jelco SA-750 or standard Techie arm? These would be ideal for many people using low compliance cartridges on heavy headshells who need a suitably 'beefy' weight at the other end to balance things out.

If so, I can see a nice little side-line for you from which to earn some pocket money!

Marco.

[Magna Audio]

Hi Steve,

Yet another brilliant D.I.Y project - and one dear to my heart too, as I love Schick arms, so well done! I'm glad that it's worked out so well

You are also so right about over-egging the mass with cartridges, and how things sing when you get it spot on - been there, done that, many times with the DL-103 and plenty of other cartridges, so I know just how significant the effect is of getting things right in that respect!

Would you consider making custom-made extra-heavy counterweight balances to order, made from brass, for the likes of tonearms such as the Jelco SA-750 or standard Techie arm? These would be ideal for many people using low compliance cartridges on heavy headshells who need a suitably 'beefy' weight at the other end to balance things out.

If so, I can see a nice little side-line for you from which to earn some pocket money!

Marco.

I would - it depends on the shaft dia. I have most usual sizes of hole cutters and could build a database of them.
If there are odd sizes I can machine out larger ones if a short length but it better to drill or holecut.
These would have a simple grubscrew and slide on unless there's a spiral carrier that lets you slide a different weight on like the Acos PL-71 arm does...

So if you want a weight let me know :
- diameter size inner
- diameter size outer
- what mass.

I can then work out how much needed. Perhaps there is a cheat sheet on the web for this. I only really want to use brass as it's nice to machine - forget titanium. Gold at your expense and I would keep the filings and off cut

I will see what bar stock I have or have to order more.

I tend to just finish with fine emery cloth as lifes too short for mirror finishing polishing and unless you lacquer they tarnish. The satin finish you see in the pics lasts for at least months like that.
Lacquering would be possible too

Could certainly do normal sizes for £25 + postage.

The 12" SPU weight is a little bigger than most

[MartinT]

Very nice engineering and elegant looking arm. Thanks for the picture story!

[Marco]

Hi Steve,

I would - it depends on the shaft dia. I have most usual sizes of hole cutters and could build a database of them.
If there are odd sizes I can machine out larger ones if a short length but it better to drill or holecut.
These would have a simple grubscrew and slide on unless there's a spiral carrier that lets you slide a different weight on like the Acos PL-71 arm does...

So if you want a weight let me know :
- diameter size inner
- diameter size outer
- what mass.

I can then work out how much needed. Perhaps there is a cheat sheet on the web for this. I only really want to use brass as it's nice to machine - forget titanium. Gold at your expense and I would keep the filings and off cut

I will see what bar stock I have or have to order more.

I tend to just finish with fine emery cloth as lifes too short for mirror finishing polishing and unless you lacquer they tarnish. The satin finish you see in the pics lasts for at least months like that.
Lacquering would be possible too

Could certainly do normal sizes for £25 + postage.

The 12" SPU weight is a little bigger than most

Ok, I'll make the above into a sticky in Analogue Art and people can contact you accordingly - I can see a few people being interested in this!

What about custom-made arm plates for certain T/T & tonearm combos?

Marco.

P.S Could you supply a contact email address to attach to your 'ad' which you don't mind remaining in the public domain?