Pickup SRA - starting from a 500x microscope

Viridian,

I agree that small changes in SRA are noticeable, I do however subscribe to the idea that starting from a technical correct point is the proper way to go.

Good Listening

Peter

I think Peter and Viridian are both correct but are differing in approaches. I use both. When I get a new cart or change carts, I set my SRA by ear first. That process takes a few days of listening and experimenting. I then check my SRA setting with a digital microscope. By ear I usually have it set around 91 degrees. I change the SRA to 92 degrees using the scope, but of course marking my original placement for reference.

So far, every time I have changed to 92 degrees using the scope, the sound dramatically improves - especially in transparency, air, decay and realism. I'm definitely in the SRA to 92 degrees camp.

I have a Dino-Line AM3013T that i use to set up SRA for an XV1's and A90 and encounter the same difficulties as the OP using the software (DynoXcope) that came with the scope to determine the angles. If it was a matter of just pointing the scope at the platter/styli and and getting the rake angle with one "click" that would be easy.
I have a Sota Cosmos IV and getting the scope as close to the platter as possible to take a perfect picture is difficult to begin with (due to the plinth).

Once you have done that, using the DynoXcope software, you have to draw an horizontal and vertical line thru the centre of the styli to determine the rake angle. I had sent a few pictures i thought were at 92 degrees to Wally and he estimated one to be at 89d and the other one at 94d when i was convinced that i had hit the 92d mark. I found this exercise very frustrating.

Adjusting VTF, AS, Azimuth, overhang, zenith, is quite easy versus setting 92d SRA accurately with a scope. Unfortunately, for me using this scope and/or software gives me a rough estimation at best.