richardkrebs
Responses from richardkrebs
| Direct drive vs belt vs rim vs idler arm HalcroYes it is a JVC motor. After I sold my Goldmund, I had plans to build a TT based around this motor. It was an easy purchase from JVC in Japan, at the time. The project was shelved after further research on motors. | |
| Direct drive vs belt vs rim vs idler arm Have just pulled apart an old Goldmund motor I have lying around.I am impressed all over again with its speed sensing design.It has 164 slotts and 176 magnetic poles ( north plus south) in the speed sensor assembly, per revolution. This gives 14,4... | |
| Direct drive vs belt vs rim vs idler arm 'Ultrasonic' They are possibly referring to the speed measuring sample rate. It is a long time since I looked at the Goldmund speed sensor, but from memory, it was around 34,000 samples per revolution. This is not an unusually high number for a sp... | |
| Direct drive vs belt vs rim vs idler arm Dover.We have covered servo control in depth in this thread.I do not understand why some people are so down on this approach. It is just feedback. Sure it has to take into account inertia, complaince and torque. These very same elements are presen... | |
| Direct drive vs belt vs rim vs idler arm Ct0517Re the Bear that tries too hard. He doesn't have to been so stressed.I can help him relax. | |
| Direct drive vs belt vs rim vs idler arm Ct0517.In my view both types of feedback have a distinct sound in their "as built" states. Firstly I need to state two things.1) I have a commercial interest in this topic, so you may want to take that into consideration.2) How a machine is design... | |
| Who needs a MM cartridge type when we have MC? Rauliruegas.re SUT's you may want to check out the Stevens and Billington TX-103, out of the UK. While specs only tell part of the story, it does seem to be to be pushing the envelope of performance. They are in curent production with either coppe... | |
| Direct drive vs belt vs rim vs idler arm KetchupI will take your figure as correct. I did the calcs long hand while waiting in a Cafe for a Flat White ( that's a coffee to those from the Northern Hemisphere)Yes the number is small and if you extend the distance out further, which we are ... | |
| Direct drive vs belt vs rim vs idler arm Gentlepeople I have been pondering our obvious passion about speed stability with respect to different drive systems. If we put aside the potential for all of us to view this topic thru somewhat colored glasses, due to our purchase choices, we can... | |
| Direct drive vs belt vs rim vs idler arm HalcroDo you have any theories other than eccentricity as to why the results with the Feickert are inconsistent? Thanks | |
| Direct drive vs belt vs rim vs idler arm DoverI do not think that the published specs for the SP10 are wrong.....There is no measurable speed change due to stylus drag.I have alluded to another problem with speed stability in DD TTs that is unrelated to stylus drag or cogging. See my ear... | |
| Direct drive vs belt vs rim vs idler arm Ct0517The Krebs upgrade causes no material change to the platters inertia and I have not done any tests on the effect, if any, of extra mass via heavy matts or clamps. This was part of my line of questions to Halcro on any changes to the 101's pla... | |
| Direct drive vs belt vs rim vs idler arm HalcroThe reason for my question was that it is popular to add significant inertia via metal aftermarket mats. The thought is that this can screw with the servo, which if excessive, it should. I was curious, given the tight control, spot on freque... | |
| Direct drive vs belt vs rim vs idler arm HalcroThanks again for doing these tests they are most interesting. I did reply almost as soon as you posted. But it seems that I have suffered from moderator silencing I did note the dampening influence of the second tonearm on the DD but it is i... | |
| Direct drive vs belt vs rim vs idler arm Dover.To answer your questions.The servo does not know if you are going to play Mahler or Beethoven before the fact, but it does know very quickly when you do. The feedback is very fast. In much the same way that we do not know where a tennis play... |