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  3. 1357958185

Crackling distortion

I have a used (new to me) VPI Scout with a new Dynavector 20x2L with a bunch of new vinyl to go along with it. I used the VPI rig to set it up and followed all the instructions on se up, with the amount of anti skate be set right not 100% there. I have a Shure force guage and I'm running 2.2g grams + .1g per VPI recommendation. 2.2 is max for DV cart.

I've noticed on some albums I'm getting a crackling distortion in some high transients and on some vocals - especially the emphasized.

I'm not sure what I'm doing wrong or what to do next. I did notice that after 12 hours on the new cart I had just a hair more than the 2.3 g of force, so I adjusted that yesterday, but I'm still hitting the crackling. Could I of already damaged the cart?

I double checked the overhand with the VPI and its right on the dot. My VTA is level.

The record is new and freshly cleaned and dry. The needle was brushed and cleaned as well. Both channels seem equal as well.

Any help would be appreciated.
last_lemming
bifwynne
2,206 posts
 
Butt end up. Adust by ear.
tswisla
176 posts
 
The problem is most likely the downforce gauge. It is measuring the force significantly above the level of the playing surface. I experimented with a digital gauge. If I put even a single record under the gauge, it was measuring almost 0.1 more than without the record. It is very important to measure tracking for AT the level of the playing surface.
bifwynne
2,206 posts
 
Agree with Tswisla -- buy a Radio Shack el cheapo digital.
last_lemming OP
638 posts
 
Well I thought I had everything sorted, but now I think the crackling distortion might just be the record, not the TT. Last night I put on a record (brother where art thou soundtrack) and the first side was fine, but as soon as I flipped to the second side I started getting the distortion at the end of emphasized vocals. So I got out my old middling pioneer TT that I rescued from the garbage and refurbished. It has a green Grado cart that I threw on it when I fixed it. I hooked it up to my Onkyo receiver in my "man cave" and what do you know, same distortions from the same moments in the song were heard.

The only thing that disturbs me is that I heard this similar etched vocal distortion (emphasized vocals not soft vocals) on "tea for the tillerman" lp but that was on the last track on a side which makes me think its end of lp distortion, though it seems more sever than maybe it should. Its a brand new album. How bad does the end of lp distortion usually sound? I can't imagine it would be so bad as to be hearing screechy etched vocals. I played around with TF to no avail, and I triple checked my overhang with the VPI jig so I'm good there. It might be the album, but I'll need to try it on the pioneer TT to be sure.
bifwynne
2,206 posts
 
LL, if you eliminated the electronics it's either the TT set-up, or the speakers which I assume are fine. I have some familiarity with DV and I would be pretty surprised that your low output cartridge is overloading your receiver's phono input section. As stated that leaves the TT.

I would try reducing the VTF to the low side of the recommended range. I think my HO calls for VTF of 1.8 to 2.2 grams. Try 1.8 grams and report back.

From what you've said, azimuth and alignment should be ok. Unless VTA is way, way off I'd be surprised that is the source of the problem.

So try the other TT. Kinda doubt that the VPI is the source of the problem. If everything else checks out after trying your old TT and reducing VTF, I would try another carty in the TT. It's very unlikely but possible that the carty is defective.
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