[orthobiz]

The SAMA motor is free of noise/vibration BUT I have to give the platter a nudge to start it up. Otherwise it just sits there and doesn't spin. Wonder if that's normal. It doesn't say anything about that in the manual.

Paul

[Wayner]

Is your motor the 300 RPM version or the 600 RPM version? (large or small pulley)

The start up torque should be more then enough to start the platter. I can use my motor like a record cleaning machine if I wanted to, using my Discwasher brush with what ever pressure I want and would not ever even com close to stalling the motor. Me thinks someting wong.

Wayner 

[Wayner]

Here is a couple of photos of mine.

 

 

The motor on this table is 600 RPM. To determine the RPM of your motor you need to measuer the platter diameter and the pulley diameter (with some guesstimating).

MY platter measures 11.562 diameter. So you take PI X 11.562 = 36.324665 X 33.33333 = 1210.820
The pulley roughly measured about .64 X PI = 2.010 or something and that. 1210.820/2.010 = 602 so a little error, but it's 600 RPM.

Wayner     

[Wayner]

For those who insist on using thread or something other then the VPI round belt, keep in mind that your RPMs have changed and you are now not spinning at 33 1/3 RPM. The reason for this is that the VPI pulley is V shaped and the belt actually rides on the sides of the V making it's diameter slightly larger then the thread riding at the bottom of the V. Therefore, the table will run slower, and you may have some slippage. If you have an SDS speed controller, you can compensate for this, but will have to rely on a strobe disc to dial in the correct speed, as the digital read-out of the SDS unit will be off.

Wayner

[rcag_ils]

I would think that is a good thing because on the warped recorded the grooves are no longer parallel to the platter, and so the shift in azimuth by the uni-pivot allows it to track the grooves more "accurately", no?

I also think it's a good thing that the unipivot arm's azimuth can self-adjust to the warp records

[Wayner]

I think the rolling action is way over compensated due to the mass and the vertical pivot height. Just like a small boat rolling with the waves on the water, the small stylus can't possibly keep the inertia of the arm from over compensating the roll, causing a bad contact area of stylus with record. I sure type of stylus will make a difference as well, from elliptical, to fine line or shibata. Of course, all of this depends on the depth of the warp, the warp area actually makes a cone, sloping down to the spindle, and I agree that the tangential angle changes with the position relative to the warp. A fixed pivot tonearm has other problems as it merely goes up and down with the warp, but it's contact area changes also in the record groove. In my mind, they both have problems, but different problems. The best solution is to not have warped records!

Wayner 

[twitch54]

If you have an SDS speed controller, you can compensate for this, but will have to rely on a strobe disc to dial in the correct speed, as the digital read-out of the SDS unit will be off.Wayner

Good afternoon Wayner, FWIW, you must ALWAYS use the strobe disc, for the two digital readouts on the SDS only indicate voltage (VAC) and line frequency (Hz).

Regardless for those with a AC synchronous motor, as John said, it's a very worthwhile upgrade !

As for the warped record issue with the uni-pivot arm, myself I do not have any problems what-so-ever given the fact that I utilize the VPI perf ring in combination with my BDR clamp.

[Sonny]

Good afternoon Wayner, FWIW, you must ALWAYS use the strobe disc, for the two digital readouts on the SDS only indicate voltage (VAC) and line frequency (Hz).

Regardless for those with a AC synchronous motor, as John said, it's a very worthwhile upgrade !

As for the warped record issue with the uni-pivot arm, myself I do not have any problems what-so-ever given the fact that I utilize the VPI perf ring in combination with my BDR clamp.

Dave, that is true...I have the SDS on my TNT Table and it's like "amazing"!  It's not cheap, but nice and "worth" it.  Still using those cables I made you?
T

[Wayner]

Good afternoon Wayner, FWIW, you must ALWAYS use the strobe disc, for the two digital readouts on the SDS only indicate voltage (VAC) and line frequency (Hz).

Regardless for those with a AC synchronous motor, as John said, it's a very worthwhile upgrade !

As for the warped record issue with the uni-pivot arm, myself I do not have any problems what-so-ever given the fact that I utilize the VPI perf ring in combination with my BDR clamp.

Hi Dave! And yes, I always trust strobe disc for speed accuracy. Certainly, I'm not trying to "demonize" the VPI tonearms, but they do have their own unique quirks, as all other arms with quirks of their own. The point I was making was actually from other VPI owners that saw the arm action and had concerns. The record clamping ring would solve those problems, instantly.

Have a good day, my friend.

Wayner 

[twitch54]

Still using those cables I made you?

You bet Tuan, love 'em like the day they were new !...thanks again !

[AudioSoul]

    I have a HW-19mk2 that is bone stock, and I plan on keeping it that way. I have the SDS and cant feel nor hear any vibration from the motor. I have found that the law of dimminishing returns as to how heavy a platter is. To heavy and it sucks the life out of the music. To light and the bass suffers. Medium (which is what I concider the mk2 platter) and you get the right ballance. I have had many TT's, Scouts, Sota Sapphires just to name a few. JMHO.....