new with TD124: basic start & questions

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yak66
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new with TD124: basic start & questions

Post by yak66 » 07 Dec 2019 18:56

new with TD124
basic start
basic questions
1. how to isolate the TT on the table?
2. How to level the TT?
3. what to put here? (see arrows in the image)
4. How to reduce the oscillation of the plate? (video)
5. Other / things to buy?
http://jazzbass.altervista.org/Lab-124.n.jpg
http://jazzbass.altervista.org/Lab-124.p.jpg
VIDEO >>>>
https://www.youtube.com/watch?v=DawZfuUdsf8
**** THANK YOU ****

tlscapital
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Re: new with TD124: basic start & questions

Post by tlscapital » 08 Dec 2019 14:53

yak66 wrote:
07 Dec 2019 18:56
new with TD124
basic start
basic questions
1. how to isolate the TT on the table?
You mean the turntable (TT) from it's support (table) ? If so it all depends on what you can afford to do/build and your use of it. The general idea for any turntable is to be immune from solid borne vibrations. There are different ways to achieve that but a sturdy surface is mandatory.

With your very TD124 and it's deep plinth one good, easy and cheap option would be to give a very heavy effective mass base. This will also improve it's inertia which should prove most beneficial for your cartridge transcription. You can then rest it on some "soft" dampening material.
yak66 wrote:
07 Dec 2019 18:56
2. How to level the TT?
Check the database on here and get the user's manual.
yak66 wrote:
07 Dec 2019 18:56
3. what to put here? (see arrows in the image)
Between the turntable and the plinth nothing. Between the base plate of the plinth and the turntable support, one could use some soft material like a piece of carpet or some sorbothane pads/feet. Don't forget to check the density of the sorbothane fabric with weight of turntable.
yak66 wrote:
07 Dec 2019 18:56
4. How to reduce the oscillation of the plate? (video)
This to evaluate just by the video is hard but could it be a bent spindle/shaft or a warped platter ? In both cases unless one is equipped with the tools and know how, one should first try a swap with another top platter and main spindle bearing and troubleshoot from there.
yak66 wrote:
07 Dec 2019 18:56
5. Other / things to buy?
So many but in any case do every tweak, upgrade and switch one at a time and take the necessary time to evaluate how it does suit you better or not and if ever not so much; unwind. Start with the simple and cheap trials like with matts thickness and materials. Cartridge swaps with or without dampening.
yak66 wrote:
07 Dec 2019 18:56
**** THANK YOU ****
Welcome ;)

yak66
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Re: new with TD124: basic start & questions

Post by yak66 » 08 Dec 2019 16:15

Thank you very much tlscapital !!

user510
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Re: new with TD124: basic start & questions

Post by user510 » 09 Dec 2019 18:24

yak66 wrote:
07 Dec 2019 18:56
new with TD124
basic start
basic questions
1. how to isolate the TT on the table?
2. How to level the TT?
3. what to put here? (see arrows in the image)
4. How to reduce the oscillation of the plate? (video)
5. Other / things to buy?
http://jazzbass.altervista.org/Lab-124.n.jpg
http://jazzbass.altervista.org/Lab-124.p.jpg
VIDEO >>>>
https://www.youtube.com/watch?v=DawZfuUdsf8
**** THANK YOU ****
The most alarming issue you pose is displayed in the youtube video that shows the flywheel/platter spinning with considerable vertical runout. This should not be and will prevent your turntable from being successfully setup. Investigate possible bent bearing shaft. Or, if lucky, just an improperly assembled platter/bearing. You don't have anything until this problem is solved.

re: how to level the TT....see the owner's manual which can be found here at VE in the TT database.

re: what to put here: In the first image we see the normal gap between top plinth surface and bottom of chassis. This is normal when the rubber mushroom isolators have been installed. That image looks ok to me.

re: what to put here, second image where we see a chunk of poly material being substituted for a rubber foot. This is optional and many people do different things for footers. You can go to your local hardware store and buy some heavy duty rubber feet that will attach to the bottom of your plinth via a wood screw...as the factory did back in the day. Just one option.

re: other things to buy. Until you solve that issue with the platter, consider the possibility that you do not have an operational TD124 for which to buy things yet.

-Steve

yak66
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Re: new with TD124: basic start & questions

Post by yak66 » 09 Dec 2019 21:19

thank you very much User510!!

yak66
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Re: new with TD124: basic start & questions

Post by yak66 » 11 Dec 2019 08:15

user510 wrote:
09 Dec 2019 18:24
The most alarming issue you pose is displayed in the youtube video that shows the flywheel/platter spinning with considerable vertical runout.
Dear Steve, the platter spinning with considerable vertical runout has been corrected, rectified.
now the platter is lowered (2mm)
sometimes the upper platter rubbing against the chassis, or rather, to be precise, the semi-circular flat thin band (the Clutch Lever) during rotation: this is something to fix!
I have to lower the Clutch Lever height (but screws and the locking jam nut seems blocked)
..... clockwise or anticlockwise ????

I have replaced and updated all the rubber parts, Belt, mushrooms and pulley are new
the sound? I do not know.
I have to understand, the mid-bass seems too thick and strong, I would like a drier sound

yak66
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Re: new with TD124: basic start & questions

Post by yak66 » 11 Dec 2019 10:35

blue arrow: rubbing point
I can lower 1mm
or take away the Clutch Lever
this image is before work: (without rubbing)
http://jazzbass.altervista.org/Lever.jpg

yak66
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Re: new with TD124: basic start & questions

Post by yak66 » 11 Dec 2019 19:57

.. even the rubbing problem has been solved!
Now I'm looking at the sound and the rumble that seems a little too loud.
The update with new belt and idler wheel did not change anything!
I also inserted a special anti-vibration silicon motor mount rubber bushings, but ...
I'm looking for ideas to reduce the rumble
http://jazzbass.altervista.org/Lever6.jpg

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