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Versa Dynamics TT owners - calling all!
Versa Dynamics TT owners - calling all!
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Old 31st August 2016, 03:23 PM   #141
versafan is offline versafan  United States
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Can you make a recording of the noise? Perhaps with your cell phone.
I think it is probably just the noise that all stepper motors make when they start up. But I would like to hear it.

Quote:
Originally Posted by alexismaster View Post
Hi at all!
the turntable works superbly ..
I have one doubt:
when I turn it on, the engine "creaks" for a few seconds, until it reaches the speed.
and the same thing, when I turn it off.
During operation is extremely quiet.
The same thing happens when I turn on the engine without the belt, so it can not be the cause. (The spindle is perfect, so I suspect a motor issue..)
I wonder if it is normal, this noise during the accelerations phase ...
Some experience?
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Old 31st August 2016, 04:11 PM   #142
alexismaster is offline alexismaster
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Thankyou I'll try to make a recording.. :-)
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Old 18th September 2018, 09:05 PM   #143
AVWERK is offline AVWERK  United States
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Does anyone have a schematic of the controller for the 200 step motor of the model 1?
The manual doesn’t contain one and non of the upgrade sheets

Will call JB if no one comes thru.

If these are too expensive, I will more than likely just replace the entire motor assembly with a 3 phase one.
I understand the stock one has the RFI issues

Regards
David

Last edited by AVWERK; 18th September 2018 at 09:07 PM. Reason: .
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Old 19th September 2018, 01:05 AM   #144
puroagave is offline puroagave  United States
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Quote:
Originally Posted by AVWERK View Post
Does anyone have a schematic of the controller for the 200 step motor of the model 1?
The manual doesnít contain one and non of the upgrade sheets

Will call JB if no one comes thru.

If these are too expensive, I will more than likely just replace the entire motor assembly with a 3 phase one.
I understand the stock one has the RFI issues

Regards
David
Why, did you win the auction for the bits and pieces of a 1.0 that Hobson was selling on ebay?
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Old 19th September 2018, 04:30 PM   #145
AVWERK is offline AVWERK  United States
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Yes
It was a record warehouse in LA and the owners Elite AV, but met up with someone else handling the ebay sale. He didn’t know a lot about it though.

I knew the control box was gone but everything else and the upgrade pcs were there.
The right front silver disc suspension pc was missing in the pics but was underneath the table.
The arm shaft looked terrible in the photo, but polishing it up removed whatever it was nicely.
The head shell was badly oxidized so dropped it in some aluminum prep acid to remove it and relapped /refinished all surfaces

Bear said it best, the stepper design were all the rage back when JB designed it
since JB had knowledge of microprocessor design so why not be different and unique ? From that point of view it makes sense why he went in that direction.

I will probably gut the stepper design for a more practical synchronous 3 phase

Other than the bearing, all the suspension discs and even the tonearm mount are just glued in. Not even bolted. At this late stage I would question owners now to modify theirs or at least check theirs. One might just pop off and damage a cartridge or hit the shaft. Realize your table has been just sitting there for 25 years against this glue interface. I will drill and tap the top discs for security

The suspension design and the Well tempered style bearing design is counter productive in that you need a a strong pull for the totem pole shaft centering.
The suspension should be a hanging one instead of the plinth resting on top of the springs in compression.
With the motor pulling in line with the hanging spring point a better non invasive style would work out better IMO . I think it would be the lesser of 2 evils. 2 of the springs should be counter wound at the same time

If any of you kids has a schematic it would help so I could at least get the info to the timing steps for everything this side of the motor control.

Regards
David

Last edited by AVWERK; 19th September 2018 at 04:31 PM. Reason: .
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Old 19th September 2018, 05:19 PM   #146
puroagave is offline puroagave  United States
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I spoke with Scot Markwell (Kuzma dist) who was listing it for Mike (nee Classic Records, High Fidelity, etc) while the auction was running.


The platter bearing is ceramic as you've found out, the two opposing discs are self centering (it shouldnt flop around like the well tempered design, but I understand the analogy). There's a special grease used for it. It does not spin freely like a normal thrust bearing, it intentionally uses drag in its design. The stepper motor is of the high torque variety and drives the platter easily, JB will argue they were designed to be used as a 'system' if you go w/ a 3 phase (or DC) motor or other route it will also have to be of similar torque.


The head shell is not Aluminum its Magnesium and a special dye was used to turn it black. The corrosion is not unusual and many Versas in the field have this issue. JB recommends removing the pitting with wet-dry 400 grit sand paper. 3m77 spay glue works well to adhere the sand paper to a flat straight surface then relap the flat sides of the head shell back and forth. lube it with water and a few drops of hand soap.


The tone arm is very clever and IMHO the best part of the design but requires high air pressure to run, Its an annular air bearing with a very small gap (extremely tight tolerance compared to say something like the Eminent Tech ET-2 arm). because the 'arm is short coupled it will amplify warp wow to the degree it will render the design useless if the LP being played is not tightly coupled to the platter. This design is incapable of working properly w/o vacuum hold-down. keep that in mind when you think about the restoration. If you're going to try and get it up and running you will need to speak with JB at some point, I seriously doubt schematics are floating around for what you need. John charges for his time, manuals, drawings, specs and anything and everything needed to help you put it back into service.

Last edited by puroagave; 19th September 2018 at 05:38 PM.
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Old 19th September 2018, 08:31 PM   #147
AVWERK is offline AVWERK  United States
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I do like the bearing design and have the fluorocarbon gel made by NYE.
I made an air bearing years ago and still have it and might try it, but some drag against a known force is the way to go now
The drag on it is slight and beneficial here.

Magnesium, no wonder it reacted to the acid the way it did.
Surprised it didnít catch fire grinding on it !

Inspired by the Versa years ago I reworked a ET2 with the same azimuth adjustment.
It will be interesting, low pressure vs high pressure necessary for the small surface area.
I will speculate the noise from high pressure and the tubing on the moving mass might be an issue but will find out sooner or later.

You can see the perimeter glue on the discs and those that own these, should double check theirs
3FDF45C3-EDB8-4D2C-9AA7-243DA4EFD46B.jpg

Last edited by AVWERK; 19th September 2018 at 08:35 PM. Reason: .
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