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-   -   The Incredible Technics SP-10 Thread (https://www.diyaudio.com/forums/analogue-source/261735-incredible-technics-sp-10-thread.html)

6L6 9th September 2014 03:19 PM

The Incredible Technics SP-10 Thread
 
https://origin.dastatic.com/forums/g...irst_photo.jpg
(The funny widgets are the motor hub fixing plates)

No, you are not seeing double.

This is my newest and most ambitious project yet - Technics SP-10Mk2A. Neither have a PSU, but that's not a difficult thing. Happily, both are operational, I tested them today with a friend's PSU. One has a fiddly main switch. Both are in sorrier cosmetic shape than I thought. That may prove an issue, only time will tell.

So will I make one good one from the ashes of two? I have no idea yet. Of course, having two at the end of this is always more attractive of an option. I do, however, think I may make one black, that would look quite sharp.

On the to-do list -

Re-cap the main board.
Build PSU
Adjust main board and switches as needed.
Figure out if I have one good table or two.
Build plinth(s).
Address cosmetic issues.
Determine if I can get a long armwand for my Graham, or just get a 10.5" Jelco.
Etc...



So let's get started --



Like I mentioned, both tables are operative, the biggest concerns (other than the need to build PSUs for both) is purely cosmetic.

So let's look at the tables as I received them. These photos intentionally are showing all the warts as ugly as possible.

https://www.diyaudio.com/forums/gall...0/IMG_0547.jpg
The prettier one. Not bad generally, but the marring and corrosion is all on the 'close' side of the table where it will be seen.

https://www.diyaudio.com/forums/gall.../IMG_05501.jpg
The text can be re-filled. the corrosion is fairly shallow.

https://www.diyaudio.com/forums/gall...0/IMG_0549.jpg

https://www.diyaudio.com/forums/gall...0/IMG_0548.jpg

https://www.diyaudio.com/forums/gall...0/IMG_0551.jpg
A couple of nicks in the black paint. No big deal.

https://www.diyaudio.com/forums/gall.../IMG_05551.jpg
Marring on the paint, no corrosion.

https://www.diyaudio.com/forums/gall...0/IMG_0553.jpg
Inside the brake section is very clean, and there is plenty of friction material (felt) on the band.

https://www.diyaudio.com/forums/gall...0/IMG_0554.jpg
I have no idea if this is a lot of wear or not on the hub. I thought it worth a photo, to see if anybody can compare.

https://www.diyaudio.com/forums/gall...0/IMG_0563.jpg
The platter of the prettier one.

https://www.diyaudio.com/forums/gall...0/IMG_0564.jpg
A bit of corrosion, nothing severe at all.

https://www.diyaudio.com/forums/gall...0/IMG_0561.jpg
The stock platter mat had something glued to it. I have no idea hot to get a hard adhesive residue removed from rubber...

https://www.diyaudio.com/forums/gall...0/IMG_0562.jpg

6L6 9th September 2014 03:53 PM

[img][/img]
The uglier one.

https://www.diyaudio.com/forums/gall...0/IMG_0539.jpg

https://www.diyaudio.com/forums/gall...0/IMG_0538.jpg

https://www.diyaudio.com/forums/gall...0/IMG_0540.jpg
Yes, this one is not as pretty.

https://www.diyaudio.com/forums/gall...0/IMG_0541.jpg

https://www.diyaudio.com/forums/gall...0/IMG_0542.jpg
That's down into the metal. :(

https://www.diyaudio.com/forums/gall...0/IMG_0559.jpg
The platter is certainly worse.

https://www.diyaudio.com/forums/gall...0/IMG_0556.jpg

https://www.diyaudio.com/forums/gall.../IMG_05581.jpg
This is 30 seconds with steel wool, so it's obvious that it will clean up.


Now the thing that is completely obvious to me after taking the photos and looking into them it that the 'damage' is, in fact, purely cosmetic. They got lightly wet on the top surface and were in a place that was damp or humid so that water had a chance to penetrate and corrode. But it is completely contained on the top surfaces. :) :) :)

6L6 9th September 2014 04:04 PM

The good news - The insides are gorgeous. (This happens to be the innards of the uglier one. :) )

https://www.diyaudio.com/forums/gall.../IMG_05441.jpg
Really, it's very clean. I'm still going to replace all the electrolytics, they get ravaged with age, so replacing them should last another 30 yr.

https://www.diyaudio.com/forums/gall...0/IMG_0543.jpg
It's 30-someting years old... a few cobwebs are part of the character.

https://www.diyaudio.com/forums/gall.../IMG_05451.jpg
About the only thing really showing it's age are these PVC tubes as insulation, it's breaking down a bit and weeping oily stuff.

https://www.diyaudio.com/forums/gall...0/IMG_0546.jpg
This is neat - the edge connector's clips actually fold out, so there's very little stress when using the plugs.

AVWERK 9th September 2014 04:06 PM

You can have it bead blasted (glass) if it's not to deep.
The deeper one depending on the thickness could be belt sanded down just below the inter granular corrosion.
Used to see this on Lockheed Jetstar interior fuel tanks.
Using a belt sander on the plinth area is a little crude but will work if you distribute the load over a large area.
You could finish up with a sanding block to get the final look.
And no, we didn't,t use belt sanders on jets..

Regards
David

soundofvoid 9th September 2014 05:23 PM

Your only option regarding good looks is to strip, sand, prep and paint the chassis.
You can use a similar silver/grey color or experiment with something new.
The platter can be polished by a CNC shop and look as new again.

soundofvoid 9th September 2014 06:15 PM

As for the glue on rubber mat... it's easy.
Soak in light oil a rug and rub it gently until it goes off.
Use the oil (or vaseline) to give back to the rubber that "like new" look.
If both are functional you can make two working examples...why toss anything away?
You can finance a perfect turntable with a very good plinth by selling the other refurbished specimen...

Zen Mod 9th September 2014 06:24 PM

me likee ;)

on (spinners) topic - I just got today Lenco L75 in perfect condition , regarding motor and spindle/bearing/platter

bought it for a friend , for 40E

:cheers:

rubber cleaning - put them in 45C water , with mild quantity of dish washing detergent

after 10 min or so , use sponge

rinse with same temp water

PDRCanada 9th September 2014 09:46 PM

Very cool project, I'll be keeping an eye on this thread.
What type of plinth are you planning?
What type of arm are going to use?

I am just finishing an SP-15...I was lucky, it was in pristine shape.
The plinth I made is multi layered 1" thick...heavy as heck.

You've inspired me to start a thread....:)

6L6 9th September 2014 11:11 PM

My machinist friend was around today, so I took the platters to his shop and gave them a spin on the lathe -

I think they look quite a bit nicer! :D

https://www.diyaudio.com/forums/gall...0/IMG_0565.jpg

https://www.diyaudio.com/forums/gall...0/IMG_0566.jpg

https://www.diyaudio.com/forums/gall.../IMG_05681.jpg

https://www.diyaudio.com/forums/gall.../IMG_05671.jpg
Unfortunately the platter from the 'nicer' table got dropped in the process, my fault, and got a few dings in it. This is the worst one.

I'm still probably going to go back and give the platters another round of cleaning up, I didn't bring all the compounds I wanted to try, and also ran out of time. But as they stand right now, they look much, much better than when I started. :D

SY 9th September 2014 11:13 PM

Did I mention how much I hate you?


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