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Speed Acts Up On Technics

Posted: 18 Jul 2018 03:42
by WinterCity
Hello, I had recently tightened the tonearm of my SL 1200 MK2, which basically required me to unscrew everything on the bottom, including the pitch slider, tonearm base/tonearm setup etc. from the bottom. When I put everything back together, and I played a record, occasionally the speed would jump incredibly high, and the green light would dim a bit. The calibration on the pitch slider was so bad that if I wasn't on the 33 RPM center by just a hair then the speed would jump.

My hypothesis for why this would be happening is this: I think for whatever reason I occasionally have the pitch slider in the middle, but not quite in the middle enough so it'll actually go out of the "green light middle" a little bit, and since it's calibrated so badly that means that it jumps in speed when this happens. But it could be something else.

Admittedly this hasn't happened in a while, but I really wanted to know how to prevent this. Another thing to note is that it happens usually after I fool around with the pitch slider, leading me to believe further into my theory on the second paragraph.

Re: Speed Acts Up On Technics

Posted: 18 Jul 2018 04:11
by Alec124c41
Perhaps cleaning and lubing the slider would Help.

Cheers,
Alec

Re: Speed Acts Up On Technics

Posted: 19 Jul 2018 04:41
by mclaren007
Here's a video on the care & feeding of your pitch slider:
https://www.youtube.com/watch?v=td-zA_wGlJM

viperfrank has a lot of good DIY videos on the SL 1200 MKII.

https://www.youtube.com/watch?v=L-NcdnCL41Y

Welcome to the fold. he he he

Re: Speed Acts Up On Technics

Posted: 19 Jul 2018 04:49
by WinterCity
Alec124c41 wrote:Perhaps cleaning and lubing the slider would Help.

Cheers,
Alec
What specific part should I clean? The metal bar on which the knob is placed?

Thank you

Re: Speed Acts Up On Technics

Posted: 19 Jul 2018 08:06
by audiopile
I'm puzzled - why did you remove all this stuff to tighten tone arm - tighten what part of the tonearm ? I seem to remember a double ground lug that went from the pitch slider to the arm and back to the main board ?

Re: Speed Acts Up On Technics

Posted: 19 Jul 2018 16:06
by WinterCity
audiopile wrote:I'm puzzled - why did you remove all this stuff to tighten tone arm - tighten what part of the tonearm ? I seem to remember a double ground lug that went from the pitch slider to the arm and back to the main board ?
I had to tighten a screw on the underside of the tonearm.