End of Record Distortion

Hi Thinkat,

I use a modified Denon DP59L. I found the anti-skate adjustment to be a little too much, and got better sound when I backed it off. I have a Grado The Statement cartridge, which I track at the recommended 1.5 grams. The anti-skate is set at just under 1 gram. I also set the Q-Dampener to darn near zero. Also, when is the last time you lubricated -- just a little, now -- the bearing shaft and the well at the bottom of the spindle? Shrink-wrapping the tonearm also provided better sound.

Doug ... do you think these adjustments -- especially the anti-skate -- could be involved in the end of record noise Thinkat is experiencing?

Best regards,
Paul

Hi Paul,

AS affects groove tracing of course, but all it does is alter the balance of stylus pressure between the two groove walls. If the distortion is worse on one channel than the other then AS would be the first thing to try. I didn't get that impression from Thinkat's post so that's why I didn't mention it.

There's no harm in trying of course, especially if AS is as easy to adjust on the DP-59L as it is on most arms. If the distortion is worse on the L channel, reduce AS. If it's worse on the R channel, increase AS.

Damping the tonearm could certainly help. If the armtube is resonant controlling it is essential, if you can find a way that works. People have tried all kinds of arm wraps on all sorts of arms, often to good effect. This increases the arm's effective mass of course, so there's a possible downside in terms of warp tracking and/or arm/cartridge matching. Nothing's easy in this stupid relic of a playback system that we all love too much!

What is the Q-Dampener? I don't know these tables at all.

Lubricating the bearing from time to time seems sensible, perhaps even vital depending on the bearing design. I rather doubt it would affect end of side distortion though. A badly under-lubricated bearing might make the table more vulnerable to stylus drag. That would be most audible on outer grooves.

BTW, since you have one of these tables can you recommend a compatible two-point alignment protractor? He definitely needs to check his cartridge alignment.

Someone just posted on VA that changing mats and/or clamps on his MMF 5 resulted in changing levels of inner groove distortion.

I expect that the combination which sounded best did so because it reduced intra-vinyl resonances best. This in turn gave the stylus a quieter environment, which allowed it to trace those difficult grooves more cleanly.

No idea which clamps/mats work best with these Denons, but that's another avenue worth exploring.

Hey Doug and Thinkat,

I haven't used a protractor on this 'table. I intially used the Denon-supplied alignment tool, and then used the MFSL Geo Disc for fine tuning.

I didn't like the Denon-supplied mat. I tried Sorbothane (formerly sold by Audioquest), but that seemed to suck the life out of the music. I ended up pulling the cast metal platter out and turning it upside down. On the perimeter there is a series of "wells." I glued 1/2" Sorbothane into the wells, and then filled the remaining space with GE Silicone II. I then glued 1/8" Sorbothane to the more "interior" section of the platter's underside. I also glued more Sorbothane to the inside of the plinth's side and bottom. For the mat, I first applied the self-adhesive cork sold by VPI, and then topped with the Ringmat. I lightly apply the KAB record clamp.

Removing the feet and replacing with cones helped too. The cones sit in cups; the cups sit on 1/8" Sorbothane; the 1/8" Sorbothane sits on 1.75" inch thick granite; the granite sits on 4 rounds of 1/2" thick Sorbothane; and that Sorbothane (finally) sits on the shelf. The bottom half of the motor is wrapped in a clay-like, vibration-absorbing polymer material.

The knock on direct drive is that you can't isolate the motor, and it generates vibration and noise. This is true. But if you can tame those vibrations, the system works well -- depending on the build quality of the 'table, of course. This 'table has spot-on speed accuracy with vanishingly little wow.

Doug, I mentioned lubricating the shaft and bearing well because I wondered if it was possible, if the shaft were generating noise, that the cartridge would pick it up as it moved closer to the shaft, and generate some "end of record noise." The Q-damping is a misguided attempt to dampen the tonearm assembly; it ends up just muffling the sound.

Best regards,
Paul

All the angles and forces make for an interesting discussion, but maybe your stylus is just picking up dust. Well, actually it's not a question of whether there is dust, but rather how much.

Surely you clean off the stylus before you begin to play each LP. This implies that you recognize the existance of dust.