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Measuring VTF on a Clearaudio Concept

Hello!

I'm a fairly new owner of a Clear Audio turntable, and have a easy (hopefully) question regarding measuring the VTF.

My eyes aren't as good as they once were which makes using the tiny balance scale that came with the table difficult. I purchased a cheap digital scale off ebay, but found the weight WAY off. After some research, I discovered that it's critical to measure the VTF at the same height of a record. The scale I purchased had the needle about 1/3" above where a record would be.

I've been looking at two scales.

1) Clearaudio Weight Watcher
2) Ortofon DS-1

I know the Clearaudio will measure the cartridge at the correct height. Does anyone know if the Ortofon scale will as well? The Ortofon scale is quite a bit cheaper.

Thanks
mustangjeff
mustangjeff OP
30 posts
 
Thanks for the response.

The concept is made to be used without a mat so no issue there.

I was amazing how much the weight is skewed with the verify tonearm by a small amount of vertical distance. I tried an old Shure force gauge and that was also way off.
dhl93449
455 posts
 
How much is "way off"? I would not think that .33" will make that much of a difference, depending on the length of the arm. You do need to worry about cheap digital scales having ferrous parts that will draw the magnets of a MC cart, creating large errors. Usually the ones with stainless steel platforms will be OK.

I have an Ortofon DS-3 and its a POS. Mine would never zero correctly and had large errors. I actually purchased 0.5 g, 1.0 g, and 3.0 g calibration weights to check accuracy of the scale. The inexpensive digital scales from AWS (MB-100) work quite well, and are non-magnetic.
moonglum
619 posts
 
(Assuming you don't have fine VTA adjust capability on your tonearm) you could retain your digital scale and, if there's room next to the platter, make a small shim/platform that raises the gauge(pad) to a suitable height (i.e. that matches the stylus when positioned on a 120g record). Chances are you'll have mostly 120g pressings but 150g can be chosen if you wish to average it.

The good thing about a separate platform is that it won't be as "fidgety" as a platter thereby risking damage to your cartridge should the cantilever be accidentally "reversed". Failing this you should ensure the platter is firmly blu-tacked or taped up to immobilise it when playing with scales (just to be on the safe side).

Hope this helps...
stringreen's avatar
stringreen
6,468 posts
 
Moonglum has a good answer, but remember that playing a record is a dynamic adventure. As the arm goes up to the top of a warp, it weighs more than on the flat...providing you were careful about the setup to begin with. Also vtf affects vta which is constantly changing as the record is played. VTA, affects other parameters...the best we can hope for in turntable setup is that we get as close to perfection as we possibly can do...but all of life is like that. :)
moonglum
619 posts
 
Like SG says...just to complicate matters, most unipivots are intrinsically unstable when riding warps. This is perhaps one area where gimballed arms might justifiably claim to have a slight advantage.

(Except SMEs, perhaps, whose tapered armtube can collide with the warp halfway through a side with an impact like thunder.) ;^)
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