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Jumper on SP12 pins - 1/2" inch adapter

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atvds1210
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Ontario, Canada
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atvds1210 posted on Sun, Feb 10 2019 3:04 PM

I have an SP12 cartridge with a 1/2" adapter installed, which came from a Dual 1218 turntable.  As pictured, there is a copper wire jumper between GL and a 5th pin in the center of the adapter.  

I would appreciate any information on this setup.  I have found other pictures with and without the jumper and have a couple of questions.

- Does the jumper need to be in place when using the adapter?

- Why does the adapter have a 5th pin when the SP12 cartridge has 4 pins?

The original stylus is in great condition, and I would like to be sure I don't muck anything up as I would like to install this on another turntable.  The Dual needs an extensive overhaul though I did a quick test and the cartridge sounded good.

Thanks.

 

 

 

 

 


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atvds1210
Not Ranked
Ontario, Canada
16 Posts
OFFLINE
Bronze Member

I found the answer in an SP 14 instruction sheet.  The 5th is a "Separate Earthpin" and where the pick-up arm has 4 leads, connect the centre earth and GL.  A pic from the sheet is below.


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