Geoff's spinning vinyl again!

[poppachubby]

Makes a huge difference Geoff. By stabalizing the vinyl it allows the stylus to track better, and thus reproduce better. It's one tweak that's actually audible, which makes it really rewarding. As I said, the cost is a pittance really...

[02audionoob]

It's amazing Geoff's system can experience so much vibration, don't you think, Chubbs?

[hifitommy]

i am not sure which tt youre using geoff. but one of the things i wnat to try is the ttweights periphery ring. that would add lots of effective inertia to the formula in addition to help flatten the record of warps.

i have various weight/clamps-sota reflex, maplenoll clamp, planamax lightweight clamp, and an orsonic reflex clamp (small and not so heavy). the reflex clamps help with warps to a degree but the periphery clamp has many advantages.

i only wish i had one at this time.

http://www.ttweights.com/rings.html

[poppachubby]

Perhaps you should think about relocating your table Geoff. With a bit of isolation tweaking, mine sits in between the speakers and at high volumes, won't feedback. Got any pics?

[jrhymeammo]

A fine tweak that doesn't cost too much. TTweights.com has some nice stuff. If you have a belt drive don't go too heavy. I have read that 300g on a direct drive is ideal.

Hey Poppa,

Where did you read that?
Are you talking about suspended and/or belt drive design, instead of DD?
If so, I can understand that.

For DDs, platter is coupled directly to the motor spindle, so DD TTs are less prone to speed deviation caused by added weight. If you have a link to that, I would appreciate it. I would like to know what he means by "Ideal". But really, it's all about trusting your ears.

JRA

[poppachubby]

Ideal is my word, and my assessment. I was reading from a DIY page and his main thought is that a weight should be not too heavy or light. It should also be versatile for every type of table. Have a read and see what you think. I have been quite pleased with my 320g weight that I made.

http://www.soundfountain.com/amb/puck.html

[02audionoob]

Added weight will not cause speed deviation on a belt-drive turntable until you start to stall it. It will potentially be slower to get up to speed, but once it's there it runs at the same speed it always does - dependent on power frequency. The difference between Pro-Ject's acrylic platter and their glass platter is more than double the amount of weight we're discussing here.

[poppachubby]

Added weight will not cause speed deviation on a belt-drive turntable until you start to stall it. It will potentially be slower to get up to speed, but once it's there it runs at the same speed it always does - dependent on power frequency. The difference between Pro-Ject's acrylic platter and their glass platter is more than double the amount of weight we're discussing here.

Perhaps, I wonder if the same could be said for my humble Pioneer.

[jrhymeammo]

Ideal is my word, and my assessment. I was reading from a DIY page and his main thought is that a weight should be not too heavy or light. It should also be versatile for every type of table. Have a read and see what you think. I have been quite pleased with my 320g weight that I made.

http://www.soundfountain.com/amb/puck.html

Thanks Poppa, I'll read up on it.

[jrhymeammo]

Added weight will not cause speed deviation on a belt-drive turntable until you start to stall it. It will potentially be slower to get up to speed, but once it's there it runs at the same speed it always does - dependent on power frequency. The difference between Pro-Ject's acrylic platter and their glass platter is more than double the amount of weight we're discussing here.

Hmm. I guess that's something we all have to observe on our own, but on my Technics and PJ Belt drive decks, 2lbs of weight certainly slowed down the platter.

Do what sounds best I guess.

[02audionoob]

Hmm. I guess that's something we all have to observe on our own, but on my Technics and PJ Belt drive decks, 2lbs of weight certainly slowed down the platter.

Do what sounds best I guess.

Slowed it down to a consistent slower speed or slowed it down erratically like it was going to stall it? Or maybe your belt was slipping? Take a look at the Wikipedia article on AC synchronous motors. One of the bullet points under Advantages says, "Speed is independent of the load, provided an adequate field current is applied." The glass platter on my Music Hall MMF-5 weighs over 3 pounds.

[poppachubby]

Slowed it down to a consistent slower speed or slowed it down erratically like it was going to stall it? Or maybe your belt was slipping? Take a look at the Wikipedia article on AC synchronous motors. One of the bullet points under Advantages says, "Speed is independent of the load, provided an adequate field current is applied." The glass platter on my Music Hall MMF-5 weighs over 3 pounds.

How much does the acrylic one weigh?

[02audionoob]

How much does the acrylic one weigh?

Needle Doctor told me the Pro-Ject Acryl-It platter weighs 1.6 pounds. I have not found a confirmation of the exact number, but at the Sumiko website I found the weight of the Xpression III is listed as 12.4 pounds and the Debut III is listed as 14 pounds. From outward appearance, it appears that this difference in weight of the two turntables would be due to the lighter platter on the Xpression III.

To be more specific about my Music Hall glass platter...it weighs 62 ounces. The GrooveTracer website says their acrylic platter for Rega matches the weight of Rega's glass platter at 70 ounces by using acrylic of a larger dimension than other acrylic platters. The GrooveTracer owner believes it is necessary to maintain the mass of the original platter and has stated that in other forums, like AK and VE. I suspect there's one advantage to the lighter platter in that the turntable could probably recover faster from wow and flutter with less weight to turn. However, the greater mass has more inertia, so it might experience less deviation in the first place...flywheel effect. I've been meaning to read up on that, but really I'd just like to hear it for myself.

[poppachubby]

Ya I don't know about that. Without any drive, the belt wil slow down the platter. Even if it's big and heavy I'd be surprised by any other result. Anyhow, I guess it just depends on a specific table as to whether it's too heavy or not.

[02audionoob]

Ya I don't know about that.

I don't follow. Don't know about what?

[poppachubby]

I suspect there's one advantage to the lighter platter in that the turntable could probably recover faster from wow and flutter with less weight to turn. However, the greater mass has more inertia, so it might experience less deviation in the first place...flywheel effect. I've been meaning to read up on that, but really I'd just like to hear it for myself.

This...

[02audionoob]

Do you think there's an advantage to having either more or less mass in the platter? The guy at GrooveTracer is specifically trying to maintain mass in his platter.

[poppachubby]

Well I can't really say I know. Certainly more mass as far as thickness is a good thing in terms of vibration. Also with a clamp, we know the added benefit of more mass, particularily acrylic is a good thing. But when it's too much, I don't know. Like I said, probably requires the owner to test the waters on their specific table.

[02audionoob]

I believe more mass and therefore more inertia makes good sense, especially if you can minimize friction, like in the case of Clearaudio's magnetic bearing. If I understand correctly, Rega seems to believe not so much in assemblies that resist vibration but rather in assemblies that dissipate that energy quickly.

[poppachubby]

At what price point do they "believe"? Does the 1 model have it? Of all the big tables, I know Rega the least.

[02audionoob]

I think the slim but very rigid plinth is representative of Rega's philosophy starting with the P1. Look at the platter of the P9, though...ceramic. Extremely hard material.

[poppachubby]

OK, went really heavy on this one. 1.25Kg...so far results are quite pleasant. Superior depth.

[02audionoob]

Huge!

[poppachubby]

Looks good though, doesn't it?

[02audionoob]

Is that stainless steel?