Dialing in my analog rig - Need help


I took a giant leap forward in sound quality this past weekend after deciding to check the setup that was provided by the dealer. Hell, I watched him and thought he covered everything. I was largely unhappy with the sound of my newly acquired rig. I am now only slightly unhappy as I discovered the following.

Being that it was a used Turntable/cartridge with no manual I downloaded the manual and performed the following. What I found was that my cartridge was way out of alignment according to the jig provided by VPI. That was a painless fix I than checked the levelness of the tonearm as it pertains to the platter. What I found was that the tonearm was set (or never set) all the way at the bottom of its adjustment. Doh! So I cranked that up to "level with platter". Was that how former owner had it set? Then there was the alignment of the head shell and of course that was off too. Now I was on to the tracking force which I defaulted to slightly more than 2 grams. The gauge I have is kind of crude compared to what the dealer was using but then the dealer seemed to miss a few items anyway...

As I mentioned earlier in this post, although being very unhappy it has gotten a LOT better. Many smiles have practiced over the last few days but one thing that still plagues my setup is the graininess or lack of smooth sounding highs. It's detailed as hell but vocals still have a "grain" to them. Nice staging and a goodly amount of air. I just seem to lack the smoothness I thought would be natural to vinyl.

Setup is;
VPI Scoutmaster, Dynavector XXV Mark II which feeds a PS Audio GCPH phono stage then direct to a Pass Labs amp. MBL 121 speakers. No preamp yet - still looking.

What's next?
128x128desalvo55

Showing 14 responses by stops

OOPS again to an earlier thread! I meant a 200 gram LP NOT a 200 mm one! I must proof these threads better!
You should have the arm higher than level at the back. In spite of all that has been said in this thread it DOES make a difference if you get the VTA close if not exact (for all the reasons mentioned). Read the post of 4/2/11 on "VTA and cartridge loading" I put up for my slant on this subject.
Incidentally some numbers. For a 9" arm: The arm will need to be raised in the back by about 0.16 " for a 1 degree change in SRA. This will give you some idea of what differences record/mat thicknesses can make to this number.
Love the humor! Seriously though. When you get the VTA right you will hear much better definition and "3D"-for want of a better description. Use a well recorded acoustic solo piano as a test. If it thins out too much (gets too percussive) and you lose the decay of the notes you have gone too high.

Although there is technical merit to adjusting the VTA on the fly (I have that capability also) you should balance that with the goal of sitting back and enjoying the music-but again that is a personal call.
Rodman: Your point is well taken. However the adjustment is VERY small for the record thickness (What is a Medium thickness record?). If you have the patience and the very good system and ears to hear it maybe you should do it.

If my mathematics is correct. A 1 degree change in SRA on a 9" arm would necessitate about a 41mm raising or lowering of the rear of the arm or corresponding record thickness change. We can argue if we can hear that 1 degree and I am not about to go there!!
Rodman: Since a 4mm change will be a degree in SRA. A difference between a thin LP and a 200mm one will be substantial and more than a degree as I first thought-so you stand vindicated from my end!

Do you have a range that you use in mm?
Rodmann:That's about a degree if my math is right and it is a 9" tonearm.So the LP thickness is not setting the optimum SRA. Do you agree?
Deslavo55: If you have a REGA arm a very good investment is to add the VTA adjustment setup by Pete Riggle (www.vtaf.com).

I have it on my REGA 300 arm and it is superb and allows VTA adjustment on the fly.
Manitunc: The math is trivial. The sine of 1 degree is .017 so depending on the distance of the stylus to the arm pivot this is an easy calculation.
For the record (no pun intended) I do not hear or adjust for differences in LP thickness.
Desalvo55:

There is a good way if you can see across the arm at a 3 X 4 index card that has lines. You need to draw a 4" line on one of the horizontal lines on the card (call it AC). Start at"A" end at "C". Then at the pivot end of the arm (point "C") you need a vertical line of 0.15" to be drawn (call this CD). Then connect point "A" to the top of this small vertical line (point D). You now have a 2 degree slope on the line. If you visually line up the arm (make it parallel), when it is placed on a NON ROTATING record with this line (card is on the record) by raising or lowering the arm you will have an SRA close to 92 degrees (optimum if everything is perfect) you can fine tune from there. Get the line as close to the arm as possible to avoid a viewing error. Take Care!!
ALL: I found this excellent link for turntable setup. Well worth a visit and read for all serious analog ownwers.

http://www.soundfountain.com/amb/ttadjust.html