Alternative platters ?

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05-11-2013, 10:37
Reffc

Quote:

Originally Posted by MartinT

Actually, Paul, we're saying just the opposite. Increased angular momentum certainly affects the Technics circuit, causing speed to be constantly over-corrected, which causes that 'warble' effect (now the official reference for the unstable speed heard when a 1210 doesn't like the platter it's been given).

Ah, sorry Martin, I should have read earlier posts. Hadn't realised it used servo correction.
05-11-2013, 10:44
Gordon Steadman

Quote:

Originally Posted by Oldpinkman

"DC motors" in my previous reply, should have been DC motors operating at low rotational speed (direct drive) - but you knew that!. Actually it's Owen who has the spares, but offered them to me for tests and evaluations we were discussing. Not sure how to get one over to you and know its' set up right, but can investigate. What arm would you plan to plonk on it (or do you want to borrow one of those too??) Sue is warming to the idea of a wee trip to the Charente, so i can pack a PT for you to play with. But you don't like belt drive suspendeds...:D

See if we can sort something out once the dreaded 31 Jan deadline is out the way. Might bring out a Pip too! ;)

Ah well, I'm a bit short of arms:eyebrows: Cartridges I have.

I'm playing with TTs at the mo and it would be interesting to have yet another to compare. My old Origin Live kit is in its third version. Looks like a dead standard deck but the motor is separate and stands in a cutout. Pic of early stages attached!! Avoids the usual problems with any noise transmission direct through the plinth. Just waiting on some socketry to try it.
05-11-2013, 10:49
WOStantonCS100

Martin, Marco,

Again I have to ask guys. Are you saying the "warble effect" is present when using heavy platters such as a Vantage upgraded or MN bonded platter? If so, when did that become noticeable? As I'm considering all things, I have revisited this thread: http://theartofsound.net/forum/showt...t-Marco-Towers wherein I (so far) have not found any reference to such an issue.

I'm confused here, are you guys saying it was purely sonic preference, or that there is an actual issue?

Also, if there are current users of either of these platters, I would love to know if you are experiencing the "warble effect" or not.

Thanks.
05-11-2013, 11:19
FunkArt

Quote:

Originally Posted by MartinT

Are you talking about my private life? :lol:

Well, not unless there's something you want to get off your chest here and if it would help:eek:
Certainly no one could argue that we don't have an abundance of sensitive ears here and I'm sure Marco would make an exception for going off topic.
:lol:
05-11-2013, 11:45
MartinT

Quote:

Originally Posted by WOStantonCS100

Again I have to ask guys. Are you saying the "warble effect" is present when using heavy platters such as a Vantage upgraded or MN bonded platter? If so, when did that become noticeable?

Hi Biff

The 'warble' effect appears with platters (certainly the ones I've tried) or platter/mat combinations, where the angular momentum is significantly higher than the Technics standard platter and mat combination.

It is much more audible at 45rpm - try sustained piano. It is present at 33rpm, but more subtle.
05-11-2013, 12:05
Oldpinkman

Quote:

Originally Posted by MartinT

Hi Biff

The 'warble' effect appears with platters (certainly the ones I've tried) or platter/mat combinations, where the angular momentum is significantly higher than the Technics standard platter and mat combination.

It is much more audible at 45rpm - try sustained piano. It is present at 33rpm, but more subtle.

:scratch:Now we see I'm the accountant not the engineer. I thought that the higher the rotational speed, the smaller the corrections required by the servo's and the LESS they were influenced by high inertia problems. Clearly I've had a Shrodigers cat moment. What have I got wrong? :scratch:
05-11-2013, 12:10
YNWaN

I can see that there is a move to relate this thread to the performance (properties) of DC motors in general but, in my opinion, this is not particularly valid. Many turntables that use a DC motor do not use a feedback loop and those that do do not necessarily apply it in the manner the Technics does.
05-11-2013, 12:27
Oldpinkman

Quote:

Originally Posted by Gordon Steadman

Ah well, I'm a bit short of arms:eyebrows: Cartridges I have.

I told you to be careful with that band-saw :lol:
05-11-2013, 12:33
chris@panteg

Quote:

Originally Posted by YNWaN

I can see that there is a move to relate this thread to the performance (properties) of DC motors in general but, in my opinion, this is not particularly valid. Many turntables that use a DC motor do not use a feedback loop and those that do do not necessarily apply it in the manner the Technics does.

I found a recent Utube video where Peter Qvortrup describes DC motors as not being 'speed constant' and in all cases requiring a feedback loop by their very nature ? he's wrong then ?
05-11-2013, 12:39
FunkArt

Quote:

Originally Posted by YNWaN

I can see that there is a move to relate this thread to the performance (properties) of DC motors in general but, in my opinion, this is not particularly valid. Many turntables that use a DC motor do not use a feedback loop and those that do do not necessarily apply it in the manner the Technics does.

Interested. What TTs (Radikal apart) are you aware of that don't use a servo? Without a servo, they will all drift - albeit softly and smoothly.
(For those not in the loop, Radikal re-claibrates the speed of the platter at each turn-on and relies on a slow decay for constancy over an LP)

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