Basis Audio turntable moror replacement?

[engadin]

I tried. It worked a few minutes, slowed down, stopped.

 

[microstrip]

So after one little time rest it re-starts again and again?

I would start by replacing the capacitor, although the progressive decrease in speed is not simple to explain.

 

[engadin]

Groan.
How do I get the motor unit out?
Do I have to remove the four corner towers?

Edit: yes, I did.

 

[engadin]

Well then, pics from the motor unit, inside.
,



Hopefully, it is a simple cap.
Does someone know the motor?
First motor had severe cogging with 230V 50Hz.
A. Conti then kindly sent a replacement, a “decade” motor.

 

[engadin]

Here the pics:

 

[analogsa]

Here the pics:

You may need to carefully cut through the heatshrink wrapping the hidden parts first.

 

[engadin]

A friend’s friend and electric engineer will have look at this end of the week.

 

[engadin]

The fuse seems to be 250V 2A, right?
A replacement can’t hurt, no?
Recommendations for any parts seen here?

 

[volken]

A friend’s friend and electric engineer will have look at this end of the week.

Yes he can measure the coil resistance and measure the voltage to the motor then we know more .I don't recognize the motor but there is probably inside more information concerning type.

 

[hb22]

Yes he can measure the coil resistance and measure the voltage to the motor then we know more .I don't recognize the motor but there is probably inside more information concerning type.

It's probably a Hurst motor.

 

[microstrip]

The fuse seems to be 250V 2A, right?
A replacement can’t hurt, no?
Recommendations for any parts seen here?

Surely - it is easy to replace and sometimes fuses have strange behavior.

It is a strange place for a fuse - I would expect seeing it in series with whole arrangement, not just capacitor. Using a voltmeter in AC the circuit should be easy to diagnose.

Your engineer friend should know it, but you can't measure the resistance of the coils with the turntable connected to the mains!

 

[analogsa]

Easy and cheap to replace the 1uF cap and 500R resistor, if for no other reason than to confirm the motor is indeed the culprit.

 

[engadin]

Cap, resistor, fuse, another cap.
Looks pretty basic.
Would “audiophile” parts be helpful?
I suppose so, as different power cords did make a difference.

What to choose?

Or look for some far more elaborate solution in a separate box?

 

[volken]

Cap, resistor, fuse, another cap.
Looks pretty basic.
Would “audiophile” parts be helpful?
I suppose so, as different power cords did make a difference.

What to choose?

Or look for some far more elaborate solution in a separate box?

No audiophile parts please , way more important is the value of the phasecap since this one is responsible for the motor vibration, personally I don't expect that the parts are the problem focus on the motor and let your technician measure the two coils and check if the rotor runs without friction.

 

[microstrip]

Cap, resistor, fuse, another cap.
Looks pretty basic.
Would “audiophile” parts be helpful?
I suppose so, as different power cords did make a difference.

What to choose?

Or look for some far more elaborate solution in a separate box?

IMO first you must be sure if the motor is in good condition. If it is working properly I would seriously consider adding an adjustable low distortion two phase sine wave generator - the Debut turntable deserves it.

 

[volken]

Probably is this your motor still available made by Nidec now.

 

[engadin]

IMO first you must be sure if the motor is in good condition. If it is working properly I would seriously consider adding an adjustable low distortion two phase sine wave generator - the Debut turntable deserves it.

Most interesting! Could you recommend such a unit?

 

[microstrip]

Most interesting! Could you recommend such a unit?

In fact I never bought such units, although I built and used them. Unfortunately the PCBs are not anymore easily available - the same for other great turntable motor drivers developed by knowledgeable members of the diyaudio.com forum.

It is not rocket science -see this very interesting thread

https://www.diyaudio.com/community/...ing-a-vpi-synchronous-turntable-motor.295367/

Remember you just need a 2-phase generator.

 

[thekong]

Basis Synchro-Wave Power Supply - www.basisaudio.com

Synchro-Wave Power Supply A Leap Forward in Turntable Drive Systems Description Technical Specifications Gallery Documents for Download The Basis Audio Synchro-Wave Power Supply is the finest power supply ever offered for turntables using AC synchronous motors. Delivering smooth, dual sine-waves...

www.basisaudio.com

Basis offer such a 2-phase controller for their TTs, but I am not sure what price they are asking for it!

 

[engadin]

There is no Basis distributor in Europe these days.
The Basis Synchro Wave, Naim Armageddon, Dr. Fuss Netzteil, VPI SDS and other devices recreate a better sine wave for the AC motor, as far as I know.
I already use such a device; Stromtank for all front end components.
Would an additional device as listed above bring further improvements?

Motor unit: both caps and the resistor measure ok.
My engineering friend hd disassembled the motor.
The drive shaft of the motor and the rotating magnet had come apart.
He fixed that.