Hi ,
I've got an early MRM the SOURCE /ODISSEY turntable. I find it well a sounding TT . Equipped with a zeta tonearm it retrieves more details than my LP 12 with The Ekos . As far as the Pace Time and rhythm ,
I find the lp 12 better than the Source Odissey . Someone said that the old and original motor Harman Kardon motor doesn't have enough torque for the heavy brass platter 6 kg. I'd like to update the old THE Source Odissey design give it a new DC MOTOR . Someone in Uk have mounted the ORIGIN LIVE DC Motor with good results .I can't ship my turntable to them . Does exist a nice DC motor for my old but nice MRM the source ? What can I buy ?
Sorry for my little english
I've got an early MRM the SOURCE /ODISSEY turntable. I find it well a sounding TT . Equipped with a zeta tonearm it retrieves more details than my LP 12 with The Ekos . As far as the Pace Time and rhythm ,
I find the lp 12 better than the Source Odissey . Someone said that the old and original motor Harman Kardon motor doesn't have enough torque for the heavy brass platter 6 kg. I'd like to update the old THE Source Odissey design give it a new DC MOTOR . Someone in Uk have mounted the ORIGIN LIVE DC Motor with good results .I can't ship my turntable to them . Does exist a nice DC motor for my old but nice MRM the source ? What can I buy ?
Sorry for my little english
Any turntable only needs torque to get the platter up to speed. Once the deck is at the right speed the motor only adds a tiny amount of energy to keep it at the correct speed.
Spin the platter by hand to help at start up. Also try a couple of drops of light oil in the motor main shaft.
The origin live motor controllers were technically junk. I had a v7 advanced controller with dc200 motor. Nice motor 2hit controller, it didn't have any form of feedback or even current compensation.
Their new stuff might be different.
Spin the platter by hand to help at start up. Also try a couple of drops of light oil in the motor main shaft.
The origin live motor controllers were technically junk. I had a v7 advanced controller with dc200 motor. Nice motor 2hit controller, it didn't have any form of feedback or even current compensation.
Their new stuff might be different.
There are so many variables that impact the performance of a turntable, substituting a motor that likely has greatly inferior speed stability to the original AC synchronous motor is likely just to add to the confusion.
You don't want a DC motor with no feedback based speed control as changes in load, temperature, and supply voltage will result in rather significant speed drift. a couple of decades ago I had a particular turntable made in the UK with a DC motor based drive system and an incompetently designed speed controller, it would not play through half a side before a speed adjustment became necessary.
You need to identify all of the differences between the tables and try to determine what might be the cause of the problems you mention. It may also be that the LP-12 is just a bit better, no two turntable designs provide identical performance.
You don't want a DC motor with no feedback based speed control as changes in load, temperature, and supply voltage will result in rather significant speed drift. a couple of decades ago I had a particular turntable made in the UK with a DC motor based drive system and an incompetently designed speed controller, it would not play through half a side before a speed adjustment became necessary.
You need to identify all of the differences between the tables and try to determine what might be the cause of the problems you mention. It may also be that the LP-12 is just a bit better, no two turntable designs provide identical performance.
Ths, For your kind answers . First of all the original motor is a Papst 38-09.
It is said that the same motor was mounted on the Oracle Alexandria and the Sota.
I listen to the ORACLE Alexandria many years ago and I'm sure the TT didn't lack the Rhythm factor.
I wouldn' t wrong are you saying that a poor speed controller could invalidate a good motor ?
As you said once the Turntable reach the right speed the torque shoud be enough .
It is said that the belt was the same of the THORENS TD 160 but to me that belt is too slack and the speed slowing quickly under pressure.
There is scarce literature on that turntable but it is said that the latter version was supplied with two belts that had different compliance . Hard to understand why does they made so ?
It is said that the same motor was mounted on the Oracle Alexandria and the Sota.
I listen to the ORACLE Alexandria many years ago and I'm sure the TT didn't lack the Rhythm factor.
I wouldn' t wrong are you saying that a poor speed controller could invalidate a good motor ?
As you said once the Turntable reach the right speed the torque shoud be enough .
It is said that the belt was the same of the THORENS TD 160 but to me that belt is too slack and the speed slowing quickly under pressure.
There is scarce literature on that turntable but it is said that the latter version was supplied with two belts that had different compliance . Hard to understand why does they made so ?
Assuming the original Papst motor is still functional your best bet would be obtaining or building a proper 3 phase generator like this :-
DIY 4 Phase Sinewave Generator for Turntable Motor Drive. Driving the motor with a proper 3 phase supply will significantly increase the torque, while at the same time reduce any vibration.
As has been said many times the Papst 'outer rotor' motor is (IMHO) probably one of, if not the very best motor for belt driving a turntable.
If the belt is too slack it's very easy to measure it and then order one a few millimeters shorter. Do watch out for differing belt thickesses, a thicker belt will run a little faster.
Good Luck
DIY 4 Phase Sinewave Generator for Turntable Motor Drive. Driving the motor with a proper 3 phase supply will significantly increase the torque, while at the same time reduce any vibration.
As has been said many times the Papst 'outer rotor' motor is (IMHO) probably one of, if not the very best motor for belt driving a turntable.
If the belt is too slack it's very easy to measure it and then order one a few millimeters shorter. Do watch out for differing belt thickesses, a thicker belt will run a little faster.
Good Luck
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After much thought , I think that first af all I should replace the Papst motor . And seems that I have no alternative to it . Oracle doesn't supply it anymore even if they supply an A.C. Motor for their older Delphy . Do anyone know if that new motor is as good as the original D.C. Papst ?
My apologies, I didn't check rigorously enough; the Papst motor you have is much more modern design. It sadly has nothing common with the original outer rotor synchronous 3 phase motors 🙁
It was said that , in the latter version of the SOURCE ODISSEY , the papst Dc motor was driving by two synewave outputs as it was an A.C. motor. That solution seems to work very well . A friend of mine said me that there is no sense in doing so . What do you think ?
If the motor bearings are in good shape there's no reason you couldn't do as you suggest, the controller I identified above would be suitable, but having seen pictures of the internals of the motor I don't think it was one of Papst's best design.
If you are willing to go a fair bit farther, with both cost and sophistication, I would recommend you have a read here:- 3 Phase Class D amp for DIY BLDC motor Drive
If you are willing to go a fair bit farther, with both cost and sophistication, I would recommend you have a read here:- 3 Phase Class D amp for DIY BLDC motor Drive
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