Search results

  1. V

    What turntables do you use? Pictures would be nice as well :-)

    Yes nice single phase supply .
  2. V

    What turntables do you use? Pictures would be nice as well :-)

    Yes sorry for the confusion wrong picture at the measurement picture , the three wires going directly to the powersupply.
  3. V

    What turntables do you use? Pictures would be nice as well :-)

    Yes good solution No not a two phase I understand that you cant read German language Let me translate what Papst said about the motors in the documentation ,,, Papst aussenlaufer motors were mainly build with three phase coils ,,
  4. V

    What turntables do you use? Pictures would be nice as well :-)

    Yes this motor has very good speed stability here is a test setup with a Studer capstanmotor driving a stack TD124 platters. Three phase drive .
  5. V

    What turntables do you use? Pictures would be nice as well :-)

  6. V

    What turntables do you use? Pictures would be nice as well :-)

    The Papst is a better motor then the E50 imho but you need to tune the phasecap with single phase drive for minimal vibration. But as said earlier three-phase is the best solution , you never get a shaded pole motor quiet from itself , decoupling with springs gives is the best way to go.
  7. V

    What turntables do you use? Pictures would be nice as well :-)

    As you know to find out what kind of motor it is you can use the motor itself as generator this is what I have done with the Thorens 902 5014 07 motor in the picture , 120 degr between the coils . Also a statement from Papst itself that the motors have standard a three phase coils that can be...
  8. V

    What turntables do you use? Pictures would be nice as well :-)

    Will do that tomorrow
  9. V

    What turntables do you use? Pictures would be nice as well :-)

    Most Papst motors are build as three-phase as can be seen in the technical data sheets, a Bodine NYC-12 is a two-phase motor with two coils , Papst have three coils.
  10. V

    What turntables do you use? Pictures would be nice as well :-)

    The standard motor is the E50 a shaded pole motor which is a single phase motor.
  11. V

    What turntables do you use? Pictures would be nice as well :-)

    Measurements between single and three-phase drive
  12. V

    What turntables do you use? Pictures would be nice as well :-)

    Yes the so called Steinmetz drive solution because turntables always were used on mains supply, vibration measurements shows the 100 hz (50hz drive ) vibration clearly. With the 124 I use the mechanical speed change so no adjustment needed for the drive adjustment, small speed corrections are...
  13. V

    What turntables do you use? Pictures would be nice as well :-)

    No vibration the best way to drive a three-phase motor and very good speed stability because it's is synchronous motor.
  14. V

    What turntables do you use? Pictures would be nice as well :-)

    My Thorens TD124 Reference with Synchronous Papstmotor <not the Thorens asynchronous Papst> and Three phase powersupply .
  15. V

    What turntables do you use? Pictures would be nice as well :-)

    Thorens TD124 Reference with Papst synchronous motor and Three phase powersupply .
  16. V

    New Garrard Build

    Sorry not similar the HAT powersupply is a analog oscillator with very low distorsion and a poweramp delivering a stable output voltage and frequency. The Schopper is a variac with filtering so a passieve solution not a stable output and frequency and still to much distorsion .... Volken
  17. V

    Commonwealth idler drive - any experience?

    The revision was done for a customer who made his own console for it can't publish that . But let me know when you are going to start with the revision the pictures showing the motor , main bearing and two pictures from the motor current spectrum the first is asis the motor does not lock on...
  18. V

    Commonwealth idler drive - any experience?

  19. V

    Commonwealth idler drive - any experience?

    Some months ago I overhauled a Commonwealth and build a two phase powersupply for the motor so its running without vibration.
  20. V

    Reference Turntable, The Step Beyond

    No its my own building analog oscillator and phase shifter.
  21. V

    Reference Turntable, The Step Beyond

    Indeed this the same I build for my EMT 930 .
  22. V

    Reference Turntable, The Step Beyond

    Very rare EMT 80 S turntable the forerunner of the 927 just made the last adjustments for driving it with my 3phase power supply.
  23. V

    SPEC GMP-8000 Measurements

    Jason I found the speed adjustment rather coarse difficult to adjust on the exact speed and it drifted some during testing , tension changed this this some what . Also the centerpin is below spec. I measured 7.06 mm as a result of which my rumble jig can not be fixed, it also seems to give me...
  24. V

    SPEC GMP-8000 Measurements

    I have measured the EMT 927 they are the best speed stability measurements so far , also my own 930 is very good specially with the clean 3 phase power supply I made for it. Edward M. Long off Audio magazine USA started this kind off measurements in the heyday of the turntables. Yes I...
  25. V

    SPEC GMP-8000 Measurements

    They have been mistaken in the thickness of the centerpin, which is clearly below par. measured 7.06mm so I could not use my Thorens Messkoppler. It also causes extra wow when not centered accurately ! At the same time, the speed control too coarse was very difficult to set up because the speed...
  26. V

    SPEC GMP-8000 Measurements

    Just a measurement to see how a modern turntable compares against the old idlerwheel . This one has a very low flutter components but speed stability could be better .
  27. V

    SPEC GMP-8000 Measurements

    Yes sorry but I always measure this way because these single figures tell you nothing about were they come from . Most times there is no mention about what record was used or what kind off filtering or level was used. Here you can see that the flutter components are very low but speed...
  28. V

    SPEC GMP-8000 Measurements

    Just finished some W@F measurements on the SPEC-8000 belt driven turntable , done with a Denon 3 KHz test record for speed and W@F , after this a rumble measure with the same record. Pitty enough I could not use the Thorens messkoppler because the spindle diameter was 7.06mm so I could not fix...
  29. V

    Torqueo ordered

    Seems a analog 50 hz oscillator on the right side and the Class D poweramp driving the output transformer on the left side . Kind regards Volken
  30. V

    Reference Turntable, The Step Beyond

    The EMT927 motor current at 226 Volt is 0.173A about 39 VA . The two vibration spectrum measurements show the asis vibration,, after tuning the phase network from the motor for min.vibration,, and with the 3 phase powersupply vibration . Important for a sonic improvement is the use from a so...

About us

  • What’s Best Forum is THE forum for high end audio, product reviews, advice and sharing experiences on the best of everything else. This is THE place where audiophiles and audio companies discuss vintage, contemporary and new audio products, music servers, music streamers, computer audio, digital-to-analog converters, turntables, phono stages, cartridges, reel-to-reel tape machines, speakers, headphones and tube and solid-state amplification. Founded in 2010 What’s Best Forum invites intelligent and courteous people of all interests and backgrounds to describe and discuss the best of everything. From beginners to life-long hobbyists to industry professionals, we enjoy learning about new things and meeting new people, and participating in spirited debates.

Quick Navigation

Home Forums Contact us

User Menu

Login
Steve Williams
Site Founder | Site Owner | Administrator
Ron Resnick
Site Co-Owner | Administrator
Julian (The Fixer)
Website Build | Marketing Managersing
Top Bottom