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In Reply to: RE: Accuracy? A tip you might not know posted by Mel on July 07, 2017 at 11:13:34
Understood, but doesn't this digital gauge require a 5g weight in order for it to self-calibrate?
I don't believe it "self calibrates."
The point is that for stylus VTF, better to be accurate near 2 gm than near 5 gm. Or at least know how far off you are.
Perhaps your scale doesn't self calibrate, but mine does!
It requires a 5g calibration weight (included). All one needs to do is to follow the instructions that come in the package. A simple "Auto calibration" is performed in a few seconds, then you're G-T-G.
I've performed this procedure approximately eight times in the years that I've owned this scale and it's never failed to result in a spot-on calibration.
Your comment " better to be accurate near 2 gm than near 5 gm " is an interesting point. For absolute accuracy you may be right, but I don't think I could differentiate the sound between VTF settings of hundredths of a gram apart let alone thousandths of a gram. :-)
I had one which was badged as "Pro-ject" and IIRC, I paid $70 years ago and a friend of mine purchased one as well.
Here were my impressions:
1. The batteries drained very quickly if not removed from the chamber.
2. The felt pads came off easily making it unevenly seated.
3. The platform is too thick to represent a vinyl LP of typical weight (120-140 grams), thus resulting in inaccurate or misleading measurement.
4. Overall impression of poorly made.
I later purchased a Ortofon DS-3 for $120 and I am now a happy camper.
$10 is really nothing these days, but it wouldn't work for me even if it is free when it is inaccurate or misleading.
$120 for a stylus gauge seems to be quite a bit of dough, but if you've already gone a long way and spent thousands or even tens of thousands of dollars, why skimp on the last mile?
The cheap one I bought off ebay had none of these problems.
" 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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