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changing arm heighton a SL1700 Mk1

Posted: 09 Jun 2019 14:28
by SNOB
Hi, I have a 17000 Mk 1 and the tonearm is too high. The Mk1 is not supposed to have a tonearm whose height can be changed. However, in the review section of the 1700, I found this:
"The tonearm definately IS adjustable in height. (RTFM) Their is a screw on the right side in the lift assy. Push down the lift as the screw is a hex that needs to be un-locked prior to adjustment. Then adjust height of arm with screwdriver: clockwise is lower, anti-clock is higher."
Problem is, this changes the arm lift height not the arm height!
Would anyone know more about how the change the arm height on a 1700?
Alfred

Re: changing arm heighton a SL1700 Mk1

Posted: 10 Jun 2019 20:03
by Tom_Technics
The arm height of the original SL-1700, 1800 and 1600 cannot be changed. If you cannot get the stylus of your cartridge to sit correctly on the record, there are only two possible issues. 1 is that the arm lift height is not set correctly meaning that the lift obstructs the arm even when in lowered position, or that you have an incompatible cartridge fitted.
As the tonearm cannot be adjusted in any way, I highly suggest fitting an original Technics 270C with a JICO elliptical stylus for best performance.

Re: changing arm heighton a SL1700 Mk1

Posted: 10 Jun 2019 22:21
by Chiltern
As Tom correctly pointed out you cannot adjust the tonearm height. One solution might be to use a thicker mat, a 6mm one from an SL1200/1210 could help.

I have recently fitted a Rega RB250 arm to an SL150, which uses a similar, if not the same platter, as yours. A 6mm mat from an SL1210 made it easier to set the VTA.

Alan

Re: changing arm heighton a SL1700 Mk1

Posted: 12 Jun 2019 13:48
by SNOB
Thank you both for your comments.
I know the tonearm height cannot be adjusted, despite the comment of 'Berre'.
I was just wondering about the purpose of the 2 screws beneath the rubber caps on either side of the arm base. I found the rubber caps in the part list but not the screws.

I have the original Technics 270C with an elliptical replacement stylus (although not JICO), but when playing a record the tonearm is not parallel to the record surface which I believe it should.
I also bought an AT 440MLb cart which is lower than the Technics cart.
I put a second very heavy mat below the Techics mat but the weight of the second mat is probably harmful to the bearings of the motor shaft. How canI get a 6mm mat from a SL1210?

Re: changing arm heighton a SL1700 Mk1

Posted: 12 Jun 2019 15:12
by Chiltern
6mm mats available used on ebay. For example

https://www.ebay.co.uk/itm/Technics-Rub ... 0290.m3507

In this case, specify thickness required and if shipping available to your location. No connection with seller. Other sellers/listings available including new but check thickness offered.

Alan

Re: changing arm heighton a SL1700 Mk1

Posted: 12 Jun 2019 15:47
by Tom_Technics
Are you able to provide some pictures showing the tonearm from both ends? Seeing what you're dealing with would really help in diagnosing the problem.

Re: changing arm heighton a SL1700 Mk1

Posted: 14 Jun 2019 09:29
by SNOB
Hi Tom_Technics
thank you for your educated advise.
I have no real problem, just trying to find out if there is any way to modify the tonearm height on a SL1700, and I wonder about the purpose of the 2 screws at either side of the tonearm base. I uploaded 3 images into the gallery but don't know how to download them.

Re: changing arm heighton a SL1700 Mk1

Posted: 14 Jun 2019 09:45
by JaS
They look like they fasten the tonearm assembly to the deck?

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technics_sl-1700_screws.jpg
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Re: changing arm heighton a SL1700 Mk1

Posted: 14 Jun 2019 13:36
by Tom_Technics
The rubber cover to the left just plugs a hole and the one to the right has a screw underneath which is one of three that fixes the arm assembly to the chassis. Unfortunately the tonearm of first generation SL-1700 has no adjustable VTA or any other adjustment for that matter. The review comment you referenced in your first post is slightly confused. The screw that is being referred to adjusts the height of the arm lift only. As you'll be able to see, when the cueing lever is operated, the black plastic lift bar moves with it, lifting or lowering the tonearm. Loosening the screw and adjusting the potential height of this bar is relevant to the arm lift only. The height is correct when the arm clears the tonearm rest with the cueing lever in the up position and when the bar rests just below the tonearm, so it's not touching the tonearm, when the cueing lever is in the lowered position when playing a record.