Mamimili wrote:Hello Abe
I wonder if your flexy style rack is draining vibrations in a different way to my solid metal rack?
I have not tried mushrooms, but have tried some sorbathane which i did not like, the arm vibrated, sound was very distorted.
But, i have noticed that if my antiskate weight hanger moves a fraction i get tonearm vibration......too lazy to experiment further right now
Cheers
jomar wrote:Abe,
Thanks for sharing your experience .Ofcourse i'm still persistent to use the mushroom since i already bought it , but i just couldn't make it work. I just could not understand why the mushroom doesn't work as it should . As for the sound of with or without mushroom, i couldn't stand with the mushroom as there are background noise. Will do some other experiments to make it work. hmmm, ano pa kaya puweding gawin ?
regards,
jomar
amandarae wrote:Hello Jomar,
Do you have a picture handy on how you installed the mushrooms? Did you use the original screw rods( if not, the size is M5 and can be easily bought from any hardware store)? The TD124 manual, if you have one, section of "Shock Mounting" mentions the use of the four rubber dampers.
regards,
Abe
amandarae wrote:Mamimili wrote:Hello Abe
I wonder if your flexy style rack is draining vibrations in a different way to my solid metal rack?
I have not tried mushrooms, but have tried some sorbathane which i did not like, the arm vibrated, sound was very distorted.
But, i have noticed that if my antiskate weight hanger moves a fraction i get tonearm vibration......too lazy to experiment further right now
Cheers
Hello Paul,
Could be! As to the anti-skate hanger, the way my SME manual described how it should be installed goes something like this:
Thread the loop of the bias weight over the bias lever and drop the nylon into the bias guide so that the weight hangs freely. Position the loop into the grove corresponding to the tracking force being used. Each represents 1/2 gram and remains so with either the whole or half rider weight. use the first one closest to the arm pivot fro 1/2 gram, the third for 1 1/2 grams etc. For 1/4 grams, use the next higer setting. Adjust the position of the bias guide so that, with the stylus on the outer groove of a 12" record the thread is at right angle to the bias lever.
Assuming that this is what you did, make sure that when you start balancing the arm to start with, the Longitudinal and Lateral balance are correctly so and gives you 1/2 gram per turn of the rider weight. I think this procedure is critical in order for a correct installation of where the bias guide should be positioned.
regards,
Abe
jomar wrote:Pigdog,
Thanks for the infos .. will look for a long threaded bar and lock/screw the 124 solidly to the plinth.
Paul,
Cut the armboard frame ?? .. this is a major surgery and i think it would be better getting a 12inch arm so that it rest on the plinth not on the armboard.
jomar wrote:amandarae wrote:Hello Jomar,
Do you have a picture handy on how you installed the mushrooms? Did you use the original screw rods( if not, the size is M5 and can be easily bought from any hardware store)? The TD124 manual, if you have one, section of "Shock Mounting" mentions the use of the four rubber dampers.
regards,
Abe
Abe,
The M5 threaded rod is about 3.5inch long ( not sure if still original ) and the hole in the plinth is 15mm as per template guide ( drilled till bottom of plinth ). Will try shorter screw length ( 1.5 inch ), maybe it is also vibrating due to its length.
Below are the pictures:
The TT base clearance from the plinth is around 6.5mm with level disc fully locked/screwed.
Will check on the manual about shock mounting.
regards,
jomar
Mamimili wrote:amandarae wrote:Mamimili wrote:Hello Abe
I wonder if your flexy style rack is draining vibrations in a different way to my solid metal rack?
I have not tried mushrooms, but have tried some sorbathane which i did not like, the arm vibrated, sound was very distorted.
But, i have noticed that if my antiskate weight hanger moves a fraction i get tonearm vibration......too lazy to experiment further right now
Cheers
Hello Paul,
Could be! As to the anti-skate hanger, the way my SME manual described how it should be installed goes something like this:
Thread the loop of the bias weight over the bias lever and drop the nylon into the bias guide so that the weight hangs freely. Position the loop into the grove corresponding to the tracking force being used. Each represents 1/2 gram and remains so with either the whole or half rider weight. use the first one closest to the arm pivot fro 1/2 gram, the third for 1 1/2 grams etc. For 1/4 grams, use the next higer setting. Adjust the position of the bias guide so that, with the stylus on the outer groove of a 12" record the thread is at right angle to the bias lever.
Assuming that this is what you did, make sure that when you start balancing the arm to start with, the Longitudinal and Lateral balance are correctly so and gives you 1/2 gram per turn of the rider weight. I think this procedure is critical in order for a correct installation of where the bias guide should be positioned.
regards,
Abe
Cheers Abe, the text you highlighted was my problem!
I will download the manual
Raf wrote:There are so many configurations and possibilities that surround the question of how best to mount a tonearm on a td 124 for less hum.
I've had mine mounted 2 different ways, with two different tonearms and have used two different materials for an armboard and yet I do not feel confident enough to make a strong recommendation but I will share my observations instead.
1. I am experiencing less motor hum on my 3012 now that I have it mounted on brass instead of acrylic.
2. On my double tonearm 124 setup, one tonearm is mounted closer to the motor than the other. My theory is that the further away from the motor, the less hum I am getting on my tonearm, despite both tonearms being mounted on brass.
3. I know that some have reduced hum by removing the 124's top plate and placing a doc lito mat directly onto the heavy turntable main plate (forgive my lack of prper terminology)
Hope this helps!
amandarae wrote:Raf wrote:There are so many configurations and possibilities that surround the question of how best to mount a tonearm on a td 124 for less hum.
I've had mine mounted 2 different ways, with two different tonearms and have used two different materials for an armboard and yet I do not feel confident enough to make a strong recommendation but I will share my observations instead.
1. I am experiencing less motor hum on my 3012 now that I have it mounted on brass instead of acrylic.
2. On my double tonearm 124 setup, one tonearm is mounted closer to the motor than the other. My theory is that the further away from the motor, the less hum I am getting on my tonearm, despite both tonearms being mounted on brass.
3. I know that some have reduced hum by removing the 124's top plate and placing a doc lito mat directly onto the heavy turntable main plate (forgive my lack of prper terminology)
Hope this helps!
Hello Raf,
Bingo! That is why I never pursue installing two arms on my TT ever. In my case, it is this plus the close proximity of the arm to the motor magnetic field. My opinions only btw.
3. I know that some have reduced hum by removing the 124's top plate and placing a doc lito mat directly onto the heavy turntable main plate (forgive my lack of prper terminology)
What happens to the clutch feature when changing records?
I can see your point, especially if the second platter is warp but let me express my opinion here. The TD 124 was designed, and designed properly, to have the top platter as part of the system. It is isolated from the main platter by the rubber dots along the perimeter of the main platter. This arrangement, assuming the tt is working properly (bearing, motor platter, etc.), is tried and true and survive the test of time. The TD 124 is one of the best engineered table you will ever see. If the vibrations were decreased as a result of removing the top platter and installing a mat, any kind of mat, the vibrations were not eliminated, it was masked.
Having said that, I will look in a different avenue to figure out why vibrations are present instead of eliminating one of the best feature of the TD 124. Assuming that the platter is not warp.
So there, I am just expressing my opinions. Most of the times I am wrong but you be the judge. Kindly excuse the rant of course!
regards,
Abe
Mamimili wrote:Hello Jomar
Yes, major surgery indeed
I think it would help, but being brave (or dumb) enough to put blade to frame has not happened yet. I look at it and the little voice says Just Do IT so far i have resisted but one of these days.......
You are right, a 12" makes more sense, but they are so hard to find
amandarae wrote:Hey Jhun,
Weird, I do not see anything wrong with your set up.
Yes, the M5 rod has the correct length. Is your buble level working on the table? Can you level it properly and if so, can you doublecheck if the platter is level when the clutch is dis-engaged? I'm trying to find out if the chassis is not straight with regards to the platter and bearing. This would explain why coupling it to the heavy mass of the plinth made it quieter. It is unlikely but the thing that confuses me is that why would it be quieter coupled than de-coupled to the plinth if the suspension, motor and mushrooms for the chassis, are installed.
regards,
Abe
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