Vintage DD turntables. Are we living dangerously?

violin:

If Halcro is right in his assessment, I should think that the victor/jvc tt 81 is unbeatable for the price and availability (yahoo Japan always seems to have a handful of them at any given time). Raul was very high on the denon dp 75, so that could be a consideration. I owned a technics sp10 mk2--that's very good. I've always gravitated towards the pretty Pioneer stuff (pl50ii and pl70ii).

The list goes on and on.

Thanks, Halcro!

Hi Halcro,
I have a few more questions if you don't mind.
Acquired a TT-101 motor on ebay.
Arrived today and I unpacked it and was shocked:
At first glance it appeared DOA.
Without the platter installed, as you press 33 or 45, the spindle is making grinding noises and never gets to the proper speed (33.33 or 45). The LED display shows the motor is rising in speed to random numbers below the required speed and then the counter goes back to zero and re-starts again.
Putting the internal counter switch on "hold" gets this re-counting to stop but again, speed never gets to either 33.33 or 45.

When assembling the platter on the spindle, the bottom of the platter scrapes against the base underneath it and when pressing the 33 or 45 does not turn at all. On a closer look you can see that the platter is eithef not concentric with the base's outside diameter, is not sitting in the centre as if the spindle is bent or out of centre or sitting too low.

On an even a closer look yet, finally picked on what's wrong:
The spindle is a cone which enter an opposing cone in the platter's hole.
It seems that either the spindle cone "shrank" from its original size and/or the opposing concical hole in the platter "expanded" or the spindle sits too low to engage and support the platter above the base.
The size tolerance could have been a temperature issue (expansion and contraction).
End result is that the platter sits too low and scrapes against the base,
So? I took a skinny tape and put on the spindle cone (like a very thin shim) and guess what? The platter locks on the right speed, it rotates quietly and stops on a dime when I press the stop button,
So few questions:
1. The spindle seems to have axial freedom/clearance. In other words without the platter, when I gently pull the spindle it comes up a few thous. I have noticed this on my TT-71 motor too. I assume it is relying on gravity and the motor bearing is not a thrust bearing but not sure.
From your experience, is this slight axial freedom normal?
2. When trying to rotate the spindle without the platter it seems noisy and doesn't lock on 33.33 (it does on 45 but takes a while).
As soon as I put the platter on, its dead quiet and locks beautifully on both 33.33 and 45. Is this normal? Does your TT-101 functions similarly?
3. What's with the spindle cone/platter matching cone clearance?
Have you ever experienced such an issue?
Could it be a shipping damage (bumped on the floor and the spindle moved down from its original place, which would have resulted in the same exact result?

Any additional thoughts/advice would be most welcome!

Thanks and kind regards,

Doron

I would not recommend running without the platter,often will cause lots of issues with speed lock etc and possible damage.

As to the issues was the table shipped with the platter mounted?

From your description you may have damage to the
platter ie lost tolerance of the mating area due excessive
shock.
The scraping is yet to be determined likely related to what caused the platter deformation issue.

Not a great way to start your Victor experience.

Doron:

Platter height is adjustable via a screw at the bottom of the unit (where the bearing is). You'll have to take off the metal cover to access it. It is cemented into place per stock, but perhaps the previous owner messed with it. Scraping is likely due to the platter being too low. Mine was the same way. Perhaps the bearing oil ran out or up due to shipping, thus causing the platter to sink ever so slightly? You might wait a day or so to see if it self corrects before messing with the bearing screw.

As Totem said, don't run motor w/o platter. It's calibrated for a specific load, so it shouldn't lock speed w/o platter. I'm surprised to hear that it locked at 45 for you.