What is distortion due to?


Every so often I hear distortion (like a buzz) while playing some records. Usually its when a pianist plays the upper registers really loud, like banging on the piano, but also with female voices in the upper register, loudly singing, also woth violin. Mind you, some records do not do this. But even a brand new 45 rpm pressing has one passage where I hear it (female voice).

System: VPI Scoutmaster/Sumiko Blackbird/ Musical Fidelity A308 with MM and MC phono input.

I rechecked azimuth, tracking weight, and cart alignment. Is it the recordings, or is my phono stage maxing out? I am using the MM stage because the blackbird is a high output MC and that is what is recommended.

My cart is relatively new, withless that 100 hrs on it.
dolifant
Trying different azimuths was worth doing. I've never had a cartridge so badly off-azimuth that it mistracked, but I suppose there's a first time for everything.

1. Are your records cleaned?

2. Is your stylus properly cleaned after every side?

If the answer to both is "yes", try reversing the cartridge clips and playing a few suspect passages.

If the noise switches to the L channel then the fault lies with your cartridge or its setup. The JMW's hokey antiskate "adjustment" would be a prime suspect, as would the stiffness of a new cartridge not yet broken in.

If the noise stays in the R channel then it's something later than the cartridge.
Dolifant, when you say:
" I checked and did not have a twist in the wire. I increased my VTF to 2.2g, using a digital guage placed on top of the platter"
- do you mean you placed the cartridge directly onto the digital scale?

If so, the indication on the digital scale may be reading 'high' by a significant amount due to magnetic attraction to the scale parts. My own pocket digital scale would read about 0.3-0.4g higher than the actual VTF if the cartridge was placed directly on the weighing tray. Those MC magnets are quite powerful.

The best option is to build a small ladder adapter (Wally Malewicz's idea) that distances the cartridge from the scale and also allows measurement adjustment to record height.
You post is very interesting. I too have a VPI Scoutmaster with Dynavector 20xL feeding into a Musical Fidelity A308. It's a great phonostage for being inboard, don't you think?

I had the same problem, a light crackling echoing high soprano voice and some high staccato piano passages. I tapped in the counterweight about a millimeter, (my audio guy set my TT up and I don't kwow where he set the tracking force, I hope it's not too much now, I'm waiting for him to call back), and it removed the problem, except for a very few passages of which I have since tested on multiple pressings. Same problem, whether London/Decca/SXL.

One of the worst offenders was Solti's Strauss Der Rosenkavalier in the final Rose trio; luckily it's not a problem on the Karajan EMI. I find it interesting that the VPI tracks 99% of other, sometimes insanely demanding high vocal and/or piano passages without any problem at all, why is that? Some pressing simply may be incompatible with some turntable combos. Luckily for us, as you seem to like Classical, we get to choose from many performances and pressing of the same thing.
I want to thank everyone who responded to my question. The problem is solved. It was the anti-skate, or rather the lack of.

I assumed I needed a counterclockwise rotation of the wire to provide the anti skate. WRONG! When I read the manual it said to balance the tonearm with the counterweight and move the tonearm toward the spindle. It should stop and back up away from the spindle. If not, then untwist the wire one rotation. It turns out that was CLOCKWISE, not counterclockwise, as I had suspected. When I twisted clockwise it applied force in the centrifugal direction, as needed. BINGO. One clockwise rotation and gone was the buzzing at high frequencies. I am again in analog heaven.

I promise to read the manuals carefully from now on.

Thanks again