Linear tracking turntable calibration chart

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erhard58
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Linear tracking turntable calibration chart

Post by erhard58 » 14 Nov 2018 05:29

I have a Revox B791 linear tracking turntable and I want to check its tracking etc.. Is there a suitable chart that I can download and print out to use with this linear tracking turntable, thank you!

hoolio
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Re: Linear tracking turntable calibration chart

Post by hoolio » 14 Nov 2018 09:51

There is a service manual in the library. Maybe there is something in there.

Good luck. :D

Alec124c41
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Re: Linear tracking turntable calibration chart

Post by Alec124c41 » 14 Nov 2018 15:04

Print out a 2-point protractor. In this case, the protocol and scale are irrelevant.

Cheers,
Alec

erhard58
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Re: Linear tracking turntable calibration chart

Post by erhard58 » 14 Nov 2018 16:53

Alec124c41 wrote:
14 Nov 2018 15:04
Print out a 2-point protractor. In this case, the protocol and scale are irrelevant.

Cheers,
Alec
thanks for the advise. Are you referring to the Linn Ittok / LVX / LVX+ Protractor / Mounting Template?
I am pretty new with turntable alignment/calibration. I can tell you all about tube audio gear and Revox reel to reel decks :-)
I could not find a 'two point protractor' in the forum library.

erhard58
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Re: Linear tracking turntable calibration chart

Post by erhard58 » 14 Nov 2018 16:58

erhard58 wrote:
14 Nov 2018 16:53
Alec124c41 wrote:
14 Nov 2018 15:04
Print out a 2-point protractor. In this case, the protocol and scale are irrelevant.

Cheers,
Alec
thanks for the advise. Are you referring to the Linn Ittok / LVX / LVX+ Protractor / Mounting Template?
I am pretty new with turntable alignment/calibration. I can tell you all about tube audio gear and Revox reel to reel decks :-)
I could not find a 'two point protractor' in the forum library.
ooops...dur....helps if I read it all...found it :-)

bernard1
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Re: Linear tracking turntable calibration chart

Post by bernard1 » 14 Nov 2018 17:53

Excuse me, how is a two point protactor useful with a linear tonearm ?
Are not those protractors made for pivot arms, and irrelevant for linear arms which are supposed to be perpendicular to the groove from outer to inner groove ?

erhard58
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Re: Linear tracking turntable calibration chart

Post by erhard58 » 14 Nov 2018 17:59

bernard1 wrote:
14 Nov 2018 17:53
Excuse me, how is a two point protactor useful with a linear tonearm ?
Are not those protractors made for pivot arms, and irrelevant for linear arms which are supposed to be perpendicular to the groove from outer to inner groove ?
they way I understand from the manual and watching some videos is that what is required are parallel lines correctly centered and aligned so that the tracking of the cartridge can be checked and adjusted if required. The protractor in question has those parallel lines and it makes sense to me how they need to be used for this adjustment.

borchee
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Re: Linear tracking turntable calibration chart

Post by borchee » 14 Nov 2018 19:11

A two point protractor for Revox Linatrack is nothing more than a (three actually, to check recommended tolerance) line through the middle of the spindle/LP-hole, which ideally the stylus should follow...linear tracking. The three lines are NOT parallel, as all of them run through the same point - spindle center.

It's all well explained in the SM.

Alec124c41
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Re: Linear tracking turntable calibration chart

Post by Alec124c41 » 14 Nov 2018 19:18

Look for the "Stupid" protractor. It can be used with any arm.
A linear tracker should be perpendicular to the straight line running through the center of the spindle, at all points.https://www.vinylengine.com/cartridge-a ... tors.shtml

Cheers,
Alec

erhard58
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Re: Linear tracking turntable calibration chart

Post by erhard58 » 14 Nov 2018 19:20

the graph/protractor that I downloaded will do the job just fine, thank very much for the pointer! :-)

borchee
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Re: Linear tracking turntable calibration chart

Post by borchee » 14 Nov 2018 19:27

The stupid protractor is fine, but not here, as it doesn't show the tolerance.
revox Linatrack tracking.JPG
(24.94 KiB) Downloaded 103 times

erhard58
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Re: Linear tracking turntable calibration chart

Post by erhard58 » 14 Nov 2018 21:09

well, am happy to report I got the B791 all lined up and adjusted. Tracking was very close, not quite 1mm out, however, the stylus force/weight was way too high, about 0.5gr too high, so that has been calibrated, all is good now!
Thanks again for all the input! :-D

borchee
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Re: Linear tracking turntable calibration chart

Post by borchee » 15 Nov 2018 10:47

What tracking force did you measure? It was probably just right - naimly, there are two recommended by Shure for the V15 type V:
1) 1,0 mN (1 g)
2) 1,5 mN (1,5 g) when using the dynamic stabilizer (brush).

erhard58
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Re: Linear tracking turntable calibration chart

Post by erhard58 » 15 Nov 2018 17:37

borchee wrote:
15 Nov 2018 10:47
What tracking force did you measure? It was probably just right - naimly, there are two recommended by Shure for the V15 type V:
1) 1,0 mN (1 g)
2) 1,5 mN (1,5 g) when using the dynamic stabilizer (brush).
yup, all is good now, thank you.

ChrisfromRI
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Re: Linear tracking turntable calibration chart

Post by ChrisfromRI » 16 Nov 2018 00:30

One side of the Telarc Omnidisc is designed for setting up linear trackers (tangential) tonearms and that record side is embossed. You could also take a record you hate and lay a straightedge right across the middle of its spindle hole and scratch a line with a scratch awl right across the whole record - thru the middle of the spindle hole. That is the path of the stylus with a tangential tonearm, and then just make sure your cantilever is perpendicular to that line, with the stylus on the line, all the way across.

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