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In Reply to: RE: For Marantz 6350Q: Use db systems alignment protractor or turntablebasics mirror? posted by Chet on October 25, 2014 at 01:29:55
Do you have the 45-RPM adapter? If so, you can use it to set overhang in accordance with Marantz's instructions. It should have an arrow and a cross mark where the stylus should rest. It appears from the picture in the Marantz manual that the arrow should be pointing straight back to the rear of the turntable plinth and the cartridge is then adjusted so the stylus rests on the cross-hair mark.
Once you align your cartridge using this procedure, you can check its alignment with the DB Systems protractor to find out where its null-points lie. On one side of the white DB Systems protractor there is an alignment grid that spans the entire groove area of the LP and you can find out where the cartridge lines up and then measure the distance from the center of the spindle hole to the point on the protractor where the stylus is in perfect alignment. Use a ruler graduated in millimeters. There should be two alignment null-points -- one on the inner grooves and one further out past the middle on the outer grooves.
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Follow Ups:
I -do- have the stock 45 adapter, surprisingly. Thanks
So, if I orient the the adapter correctly, would the cross mark also give me information about the effective length?
Yes, with the stylus in the cross mark, Marantz states the effective length is 8-15/32 inches, which translates to 215.1-mm. Unfortunately, that's the only tonearm parameter provided by Marantz. You can find the service manual at the Vinyl Engine website.
Thanks John.
I'll try to figure out what I'm doing here, with the asylum FAQs, and the tools and information I have.
If you are interested in a free arc protractor generator program that you can download, I really like Conrad Hoffman's Custom Arc Template Generator for Phono Cartridge Alignment . You can download it for free at the link below. There are also some basic equations for tonearm alignment geometry that apply to all pivotal tonearms that I've posted below.In my opinion, the best alignment null-point radii are 66-mm and 120.9-mm known as Löfgren A. This is the alignment recommended by your DB Systems protractor and also your Turntable Basics protractor. However, your tonearm might not be mounted close enough to the platter spindle to achieve those null-points. You might have to settle for Stevenson's alignment with null-point radii at 60-mm and 117.2-mm, which require less overhang.
Good luck,
John Elison
Edits: 04/16/17
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