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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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Axon
post Dec 14 2009, 04:19
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Antiskate is complicated, and different instructions (advocated by different people) will give widely varying results. There is no "right" antiskate setting: it varies from record to record. If you get within 50% of the optimum value for each particular record you play, you're doing pretty good. I doubt anybody gets closer than 20%.

The "normal" (and easiest) instruction is to set the antiskate dial equal to the vertical tracking force setting in grams. If you don't have a spherical stylus, add 20-50% to the VTF setting.

A more complicated method is to purchase a test record with a tracking test on it, and set the antiskate so that the level of distortion in both channels is equal. But there are good reasons to believe that this may not be an accurate way to align for optimum tracking ability, or lowest distortion, for "real" music records.

If you have a blank record (a side without a groove cut on it), and if you have a spherical stylus (which you do), you can set the VTF to 40% higher than you normally set it, set the needle down on the spinning record (being extremely careful to lift the arm quickly if it spins off the record). Then adjust antiskate so that the arm is roughly stationary at the center of the record, and set the VTF back to the normal value.

With some cartridges with very high compliance, you can observe the bias force skewing the cantilever left/right, and the antiskate force likewise. You could use this to set the antiskate so that, when looking at the cartridge from the front, the alignment of the cantilever when playing a record is the same as when it is lifted off the record. However, you almost certainly don't have a cartridge for which this will work.

This post has been edited by Axon: Dec 14 2009, 09:02
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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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