Could you also set azimuth by looking for a perfect "X" with one of those microscopes? Of course the microscope would have to be placed in front of the cartridge. Could this be a better method than looking at the cantilever and it's reflection in a mirror?
How to set SRA after determining true vertical?
Here is a picture of a stylus with zero rake angle:
http://members.cox.net/nsgarch/SRA@%200.0%20deg.jpg
Since all modern styli are symmetrical in the x and y plane about the verical z axis, the tapered stylus and its reflection will make a perfect "X" when vertical (z axis perpendicular to the groove) and viewed from the side.
This condition is established by raising or lowering the tonearm pivot post. Once you find this point, and assuming you have a typical 9" tonearm (about 230 mm from pivot to stylus) then each 4 mm you raise the post from the zero
SRA point will apply one degrewe of SRA to the stylus.
A test setup is shown in these two pics:
http://members.cox.net/nsgarch/SRA%20setup1.jpg
http://members.cox.net/nsgarch/SRA%20setup2.jpg
Equipment includes:
a mini Mag-Lite flashlite,
a first surface mirror from old SLR cameras -- easy to find at photo repair shop)
a 50X pocket microscope
bean bags
Don't forget to first remove antiskate and set VTF.
.
http://members.cox.net/nsgarch/SRA@%200.0%20deg.jpg
Since all modern styli are symmetrical in the x and y plane about the verical z axis, the tapered stylus and its reflection will make a perfect "X" when vertical (z axis perpendicular to the groove) and viewed from the side.
This condition is established by raising or lowering the tonearm pivot post. Once you find this point, and assuming you have a typical 9" tonearm (about 230 mm from pivot to stylus) then each 4 mm you raise the post from the zero
SRA point will apply one degrewe of SRA to the stylus.
A test setup is shown in these two pics:
http://members.cox.net/nsgarch/SRA%20setup1.jpg
http://members.cox.net/nsgarch/SRA%20setup2.jpg
Equipment includes:
a mini Mag-Lite flashlite,
a first surface mirror from old SLR cameras -- easy to find at photo repair shop)
a 50X pocket microscope
bean bags
Don't forget to first remove antiskate and set VTF.
.