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Numark TTUSB tonearm adjustment
rocket_pc
post Dec 11 2009, 22:03
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I have first browsed the wiki for this, though only a few minutes. My question is about adjusting the tone arm on the Numark TTUSB. Can anybody tell me where there are instructions on adjusting the counterweight on the tone arm of the Numark TTUSB and adjusting the anti-skate mechanism?

I got the turntable yesterday. The instructions in the operator's manual is insufficient, with only a few sentences on the subject that seem very ambiguous to me.

The manual says,
QUOTE
...there should be a feeling of weight and resistance when the head shell is raised and lowered. Begin rotating the counterweight clockwise (away from the pivot point) until the weight and resistance feeling is gone. If done properly, the tone arm will pivot with very little resistance back and forth indicating that there is exactly 0 grams of stylus pressure. With the counterweight in its new position further away from tone arm pivot point, grasp the scale ring of the counter weight and rotate it until "0" is in the vertical position. Finally, rotate the counterweight (and scale ring) counter-clockwise (towards the pivot point) until the desired amount of weight is reached. If the scale rotates 360 degrees beyond the zero point, the new scale ring reading should be added to 3.5.

I don't understand these instructions at all. I remember seeing somewhere last month, when shopping for this, mention of some website or other with instructions on adjusting the tonearm and antiskate functions.

Thank you, in advance, for your attention on this subject.

Don

This post has been edited by greynol: Dec 11 2009, 22:04
Reason for edit: Please use the default font. Placed quote in the proper container.
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Knowzy
post Jan 21 2010, 21:19
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QUOTE (cliveb @ Jan 12 2010, 01:34) *
You're using a Numark USB turntable. There's a limit to the quality of signal you can get from it.

Clive hit the nail on the head, in my opinion. No matter how well you tune this equipment, it isn't going to drastically improve the sound quality.

My advice- forget test records. Forget measurement equipment (with the possible exception of software).

Instead, invest up to $100 in a better cartridge and adjust the counterbalance and anti-skate using the "easy" method described by Axon and DVDdoug.

A better cartridge will result in the big improvement in sound quality you are seeking- more than any other turntable component and certainly more than any fine-tuning of the adjustments.

All of that measurement and adjustment will only improve the sound quality about 10% over a reasonably adjusted turntable (assuming you could put a number on "sound quality," broadly defined). Audiophiles (and 'philes in general) live to eek out that extra 10% of performance and will spend countless hours and dollars pursuing it.

If you want join them, you're in the right place. But you seem to be putting up resistance on the budgeting end. smile.gif
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cliveb
post Jan 22 2010, 13:27
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QUOTE (Knowzy @ Jan 21 2010, 20:19) *
A better cartridge will result in the big improvement in sound quality you are seeking- more than any other turntable component and certainly more than any fine-tuning of the adjustments.

I respectfully disagree. Some cheap turntables have poor pickup arm bearings that mean no cartridge will be able to work at its best. If the arm is sufficiently poor, the cutoff point where a more expensive cartridge gives any improvement can be surprisingly low. I seriously doubt that anything better than a fairly entry-level moving magnet would be justified on a typical USB turntable.

QUOTE (Knowzy @ Jan 22 2010, 05:27) *
I would say the average turntable buyer, particularly in this price range...

What the average turntable buyer does should not necessarily be regarded as the recommended procedure :-)

QUOTE (Knowzy @ Jan 22 2010, 05:27) *
... follows the counterbalance method described by DVDdoug, then the "easy" anti-skate method described Axon and nothing more. The next adjustment seems to be alignment and, from what I hear, it's a project that takes commitment.

If by "alignment" you're referring to mounting the cartridge correctly in the headshell (ie. so that it is tangential to the groove at the two optimum points across the extent of the LP), then this is in fact the first thing to do, before you set tracking force and antiskating. To align the cartridge correctly requires the use of a simple protractor. (You can download one here).

You should also check that the cartridge is vertical when viewed head-on, although this is rarely adjustable except by adding thin shims. Fortunately even cheap pickup arms tend to be fairly level in this respect.

QUOTE (Knowzy @ Jan 22 2010, 05:27) *
My point is that all this calibrating beyond the basic two steps won't buy you what a $40 to $100 cartridge will.

A $20 cartridge correctly aligned will sound better than a $100 cartridge badly aligned. It's not difficult to get it right, so it's worth taking the trouble.

I agree that a test LP is probably not needed here. Get the cartridge properly aligned, set the tracking force to the top of the recommended range, then start playing some actual music LPs and adjust antiskating by ear. Find something like solo piano, play a fortissimo section, and set the antiskating so that the distorion is equal on both channels.
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paulhyland
post Feb 14 2012, 20:30
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QUOTE (cliveb @ Jan 22 2010, 07:27) *
QUOTE (Knowzy @ Jan 22 2010, 05:27) *
I would say the average turntable buyer, particularly in this price range...

What the average turntable buyer does should not necessarily be regarded as the recommended procedure :-)

QUOTE (Knowzy @ Jan 22 2010, 05:27) *
... follows the counterbalance method described by DVDdoug, then the "easy" anti-skate method described Axon and nothing more. The next adjustment seems to be alignment and, from what I hear, it's a project that takes commitment.

If by "alignment" you're referring to mounting the cartridge correctly in the headshell (ie. so that it is tangential to the groove at the two optimum points across the extent of the LP), then this is in fact the first thing to do, before you set tracking force and antiskating. To align the cartridge correctly requires the use of a simple protractor. (You can download one here).

You should also check that the cartridge is vertical when viewed head-on, although this is rarely adjustable except by adding thin shims. Fortunately even cheap pickup arms tend to be fairly level in this respect.

That nails my problem exactly. When I look at the cartridge/headstock from the front, it seems to be tilted severely to the right (or twisted clockwise), so it seems as though the tonearm somehow was twisted or something, but I can't figure out how it happened. (I think it was OK when I first tried it, but it was stored and the stylus broke off, so I replaced the cartridge with a nicer Audio-Technica that fit the unversal mount). Thus every record skips backwards, as though it has very high anti-skate set, no matter how I adjust the weight and skating.

I tried shimming with a couple washers from the other (AT) headstock. It sounds like I just need to do more of this until I get it looking more-or-less level with the platter. Question: is there any tool or technique to perform this alignment with vertical? Besides leveling the table and then trying to measure the level-ness of the cartridge?

I also plan to perform the horizontal alignment with protractor you have described here - thanks!
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Posts in this topic
- rocket_pc   Numark TTUSB tonearm adjustment   Dec 11 2009, 22:03
- - DVDdoug   I don't have that turntable, but the instructi...   Dec 11 2009, 22:47
- - rocket_pc   Thank you for the reply, DVDdoug. I didn't se...   Dec 12 2009, 23:12
- - rocket_pc   Thinking about this, once again, adjusting the ton...   Dec 13 2009, 05:30
|- - MichaelW   QUOTE (rocket_pc @ Dec 13 2009, 16:30) Th...   Dec 13 2009, 06:47
- - rocket_pc   Thanks for the reply, Michael. Okay, now I unders...   Dec 13 2009, 21:24
- - MichaelW   I can't give a reasonable explanation of anti-...   Dec 13 2009, 21:28
- - pdq   As the record turns, the needle dragging in the gr...   Dec 14 2009, 00:11
|- - cliveb   QUOTE (pdq @ Dec 13 2009, 23:11) As the r...   Dec 14 2009, 09:49
- - rocket_pc   Thank you for your replies. Michael, the google s...   Dec 14 2009, 01:47
- - Axon   Antiskate is complicated, and different instructio...   Dec 14 2009, 04:19
- - Axon   Adjusting by ear means adjusting both the tracking...   Dec 14 2009, 11:40
- - rocket_pc   I could just "adjust by ear" - listen to...   Dec 14 2009, 19:47
|- - cliveb   QUOTE (rocket_pc @ Dec 14 2009, 18:47) I ...   Dec 15 2009, 09:43
- - rocket_pc   Thank you for your reply, cliveb. I hope you unde...   Jan 10 2010, 08:59
|- - cliveb   QUOTE (rocket_pc @ Jan 10 2010, 07:59) An...   Jan 10 2010, 10:52
|- - rocket_pc   QUOTE The force that draws the stylus towards the ...   Jan 10 2010, 12:26
|- - cliveb   QUOTE (rocket_pc @ Jan 10 2010, 11:26) cl...   Jan 10 2010, 15:08
|- - rocket_pc   QUOTE However, I don't believe HFS75 is availa...   Jan 10 2010, 16:41
- - rocket_pc   Hi cliveb, Thank you for your reply. I've go...   Jan 12 2010, 06:18
|- - cliveb   QUOTE (rocket_pc @ Jan 12 2010, 05:18) I ...   Jan 12 2010, 09:34
|- - Arnold B. Krueger   QUOTE (rocket_pc @ Jan 12 2010, 00:18) I ...   Jan 12 2010, 14:09
- - rocket_pc   There shouldn't be too much wear from testing,...   Jan 13 2010, 00:30
|- - cliveb   QUOTE (rocket_pc @ Jan 12 2010, 23:30) Th...   Jan 13 2010, 10:49
- - Axon   The Ultimate Test LP is also worth looking at, and...   Jan 13 2010, 00:31
- - rocket_pc   Hi audiophiles, Thank you for your replies, Clive...   Jan 21 2010, 06:39
- - Knowzy   QUOTE (cliveb @ Jan 12 2010, 01:34) You...   Jan 21 2010, 21:19
|- - cliveb   QUOTE (Knowzy @ Jan 21 2010, 20:19) A bet...   Jan 22 2010, 13:27
|- - paulhyland   QUOTE (cliveb @ Jan 22 2010, 07:27) QUOTE...   Feb 14 2012, 20:30
|- - Arnold B. Krueger   QUOTE (paulhyland @ Feb 14 2012, 14:30) Q...   Feb 15 2012, 14:41
- - rocket_pc   Hi Knowsy, I believe that you're the guy whom...   Jan 22 2010, 02:16
- - Knowzy   QUOTE (rocket_pc @ Jan 21 2010, 18:16) Hi...   Jan 22 2010, 06:27
- - Knowzy   QUOTE (cliveb @ Jan 22 2010, 05:27) I res...   Jan 22 2010, 19:06
- - rocket_pc   Thank you very much for your replies. What I thin...   Jan 23 2010, 05:23
- - Knowzy   QUOTE (rocket_pc @ Jan 22 2010, 20:23) Wh...   Jan 23 2010, 22:09
- - rocket_pc   Okay, I won't get that. How can they they eve...   Jan 23 2010, 23:14
- - Knowzy   QUOTE (rocket_pc @ Jan 23 2010, 14:14) Ho...   Jan 23 2010, 23:28
|- - arranzio   Hi Rocket I just arrived here googleing, looking ...   Jan 29 2010, 12:59
- - Knowzy   Hi Albert, Welcome to HA. That is a lot to diges...   Jan 30 2010, 02:05
|- - arranzio   Thanks for your comments, Jeff. Yes pretty long, ...   Jan 30 2010, 02:34
- - rocket_pc   Hi all, I aggree that this Numark is a lousy turn...   Jan 30 2010, 18:15
|- - cliveb   QUOTE (rocket_pc @ Jan 30 2010, 17:15) Th...   Jan 31 2010, 10:54
- - rocket_pc   Hi cliveb, I wouldn't conclude that this Num...   Jan 31 2010, 12:05
|- - cliveb   QUOTE (rocket_pc @ Jan 31 2010, 11:05) I ...   Feb 1 2010, 10:39
- - Knowzy   QUOTE (rocket_pc @ Jan 30 2010, 09:15) Th...   Feb 1 2010, 20:40
- - rocket_pc   Thank you for your replies. I've got a couple...   Feb 2 2010, 06:23
- - rocket_pc   My digital camera is malfunctioning. Reading from...   Feb 3 2010, 01:34
- - Knowzy   QUOTE (rocket_pc @ Feb 2 2010, 16:34) Rea...   Feb 3 2010, 06:37
|- - cliveb   QUOTE (Knowzy @ Feb 3 2010, 05:37) I...   Feb 3 2010, 10:01
- - rocket_pc   Thank you for your replies. Jotted down the info ...   Feb 3 2010, 17:29
- - Knowzy   QUOTE (rocket_pc @ Feb 3 2010, 08:29) Hav...   Feb 3 2010, 23:08
- - rocket_pc   Hi all, I'm back, for a moment. Up front, t...   Feb 10 2010, 10:48
|- - rocket_pc   PS: The Shure cartridge that you mentioned in thi...   Feb 10 2010, 10:56
|- - cliveb   QUOTE (rocket_pc @ Feb 10 2010, 09:48) Ca...   Feb 11 2010, 19:21
- - Knowzy   QUOTE (rocket_pc @ Feb 10 2010, 01:48) Th...   Feb 11 2010, 07:50
- - rocket_pc   Thank you for your reply, cliveb and knowsy, It w...   Feb 11 2010, 23:09


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