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Forgive the cross-postings. The question
concerns all of us doing sound preservation from disc sources.
Has anyone come up with a number for the acceptable
amount of noise in an analog system, stylus tip to converter, and how to measure
it?
I've been using my digital meters with a peak hold
feature. I play the old Victor (actually Western Electric) test
record with a 1K continuous tone and bring all levels to zero throughout the
system to the coverter, where I set it at -2 db. (If I don't, then
random shellac noises will push me into the red and I get no useful
number.) I then remove the stylus from the groove, reset, and see what
number comes up. I then subtract 2 to account for my -2 setting, and
assume that is a reading of analog system noise.
I realize that the numbers will differ a
bit,depending on stylus size- larger ones have greater output.
Comments on the procedure?
Any ideas on what would be an acceptable minimum
amount of system noise?
Steve Smolian
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