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Post by bananafist on Jun 5, 2011 8:25:52 GMT
I'm hoping someone on this forum can help with a tone/vol schematic for my MOTS supro lapsteel. I know how conventional guitar systems are wired, but when I opened up the Supro it didn't conform to any schematic I'd seen, and the volume pot seems to work as a tone pot, whilst the tone does nothing. The soldering all looks original oddly enough. Any help appreciated. I love the sound of this little 'plank' but would like to get the controls working as they should.
By the way, thanks for the advice on strings, Michael.
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Post by Michael Messer on Jun 5, 2011 10:12:02 GMT
Hi bananafist,
I am pleased you are happy with the strings.
Regarding your question about wiring a lap steel; I am afraid I am useless at that stuff, but I am sure someone on this forum will be able to advise you.
Which model do you have?
Shine On
Michael
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Post by bananafist on Jun 5, 2011 10:22:22 GMT
Hi Michael,
Its a white MOTS 6 string single neck, pretty original I think. No visible s/no or obvious model no.
Thanks
Peter
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Post by Michael Messer on Jun 5, 2011 10:26:18 GMT
Can we see a photo so we can identify it? It will be helpful to whoever comes in to advise about wiring.
Thanks,
Shine On
Michael
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Post by bananafist on Jun 5, 2011 11:34:32 GMT
OK, here goes. Attachments:
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Post by Mark Makin on Jun 5, 2011 15:03:03 GMT
Hello Bananafist
It's a SUPRO COMET. Without the serial number - can't be completely sure of the date, however - it's not earlier than 1949/50 and it's not later than 1954. Any help?
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Post by bananafist on Jun 5, 2011 15:43:21 GMT
Thanks Mark, I'm impressed! Is there a Supro info site?
Just found the little oval plate with the s/no V25825.
Any luck with a schematic, or a photo of the wiring layout of this model?
Thanks
Peter
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Post by Mark Makin on Jun 5, 2011 18:57:26 GMT
There ya go! - that puts it in the middle of 1950!
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Post by bananafist on Jun 11, 2011 11:36:30 GMT
Mark-Thanks for the date info. What I really need is a schematic or pointers towards one.........anybody?  |
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Post by pete1951 on Jun 12, 2011 11:06:36 GMT
If you send a photo of the vol/tone pots I`m sure someone can say what should be going on.
Make sure you note anything on the pots that the photo doesn`t show. PT
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Post by Tymus on Jun 12, 2011 19:07:58 GMT
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Post by bananafist on Jun 13, 2011 11:27:59 GMT
Tymus - Hey, thanks man! Page 4 has the original schematic, EXACTLY what I was after. This blog is absolute gold dust, and will help with restoring my Supro. I am chuffed to bits.
Thanks again,
Peter
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Post by Tymus on Jun 13, 2011 11:41:06 GMT
Hi Peter,
Glad it's of use to you, yea it's a great blog! I found the section on rebuilding the pickup assembly really good, it shows clearly the design and construction of these unique pickups and the photos are the best I've seen!
Good luck with your restoration, Tymus.
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Post by Deleted on May 19, 2013 14:53:27 GMT
I've got a '49 Supro that is giving me fits trying to get it up and running again. I sold it to a guy 25 years ago. He passed and his wife was going to trash the guitar because it didn't work. Lord only knows what he did to it. I have a posting in a different part of this site, but so far I haven't found any solution. The man trying to help is a little too technical for me. Perhaps if I could see a photo, I could fix my problem. This is what I've got to work with. There is only one wire coming out of the pickup. The other is grounded to the plate everything is mounted on via a soldered lug. It used to hum horribly. I grounded what I thought was the tone pot, (the non Allen Bradley) and the humming has stopped, but so has any signal from the pickup. I have nothing at all now.   |
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Post by Colin McCubbin on May 19, 2013 19:24:53 GMT
Hi, It is hard to see from your picture, but you need the wire from the PU to go to one end of the vol pot, the other end of the pot should be common ground. The Cap goes from the same end of the vol pot as the PU input and goes to one end of the tone pot, the center pin of the tone pot should go to ground. The other end of the tone pot goes nowhere (is not connected) Finally the output to the jack socket comes from the center pin of the vol pot. (it is possible that the wax electrolyte (insulation) in the capacitor has dried out and shorted the foil plates together. I'd first wire just the volume pot in as described above, with NO capacitor, so you can see if the pickup and vol control work, then add the capacitor and it's pot..) Try this:   |
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