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In Reply to: RE: Accuracy? A tip you might not know posted by blade on July 07, 2017 at 12:42:20
" The felt pads came off easily making it unevenly seated."
There are no felt pads. Just firmly glued on little rubber pads, easily replaced.
"The platform is too thick to represent a vinyl LP of typical weight (120-140 grams), thus resulting in inaccurate or misleading measurement."
The platform is 6mm thick. An LP is about 4mm thick. Do you think a difference of 2mm in height makes that much difference in the result?
Turns out the pad on my TT is exactly 6mm thick. I measured the tracking force with the pad on and the pad off. It's 1.24 grams with the pad off and 1.27 grams with the pad on. I remember something from metrology about least significant digits? Doubtful my ears could tell the difference.
Recommended tracking force for my cart is 1.25g +- 0.3g
The outer lip of many LPs can be 4mm thick but the lip doesn't ride on the platter or platter mat so doesn't affect record height.
For reference, I found that LP thicknesses range from 0.80mm to 2.20mm and the majority of "non-audiophile" LPs are 1.0mm to 1.2mm thick. That's based on measuring hundreds of LP records with a thickness gauge.
That's good info. Do you have measurements for typical 180 gm, 200 gm records?
I posted the results of 200 LP measurements on my AA gallery. I still take full measurements every so often, but don't plan on updating the results anytime soon.
Why do you measure with a record on the platter?
I don't measure them when they're on the platter, I use the top middle shelf of the stereo rack. Much easier. :-)
I measured the weight and thickness of 200 LPs just to answer a couple of questions I had about LPs. Now I know.
I continue to measure the thickness of each record so I know which platter mat to use to maintain a relatively consistent 2.0 mm record height. I just write down the thickness in the corner of each record sleeve. Doesn't take very long and once it's done, it's done.
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