Stingreen Yes its only a speed indicator, it does not control any associated motor drive functions. I have used quite a few of the Roadrunners in my DD tables, so when Bill closed shop I needed to find a replacement, none were available so we had to design our own. Its slightly larger than the Roadrunner the Aluminum case is 6.25 deep, 3.875 wide and 1.625 tall https://pbnaudio.com/pbn-dn308/ Good Listening Peter |
Lewm Yes indeed - the Denon DD's are very precise - I use the Tachometers on the DP80 Professional and the DN308 Professional. The reading is 33.333 with the last number varying a slight bit, they all lock in at "their" speed, which can be 33.334 or 33.332 and some at 33.333 The Oscillators are not adjustable on most of them - only the DP7000 and a few of the DP6000 have had adjustable oscillators. Good Listening Peter |
Lew All the Denon DD’s I work on have Adjustable speed - however as you mention this disengage the servo control. What Im talking about above is the internal oscillator from which the speed control is derived, only the DP7000 allows for adjusting the clock speed (with a small adjustable capacitor) which for the DP7000 is 300kHz. Good Listening Peter |
melm, :-) Which is why I prefer DD tables. We developed the Tachometer because Phoenix Engineering closed shop and we use quite a few of these in our Turntables. I got an email form Sota - they are indeed re introducing the Roadrunner and the Falcon they are planning on starting shipping late next month. For those whom want to see a preliminary photo of the Tachometer Im posting a picture on my Virtual page system. https://systems.audiogon.com/systems/4923#&gid=1&pid=15 Still need to get the Smoke Gray Plexiglass front panels done - this will tame down the brightness of the LED Display. Good Listening Peter |
Melm, The reason to put the Tachometers in the turntables to display their accuracy. If you got it flaunt it. :-) I don't hear the "servo hunting" your describing rather I hear consistency in tempo, great pace and drive. I do add substantial weight to the platters of these tables by adding copper mats, this of course increase inertia so if what your describing exist its effect is greatly diminished. I have built several plinths for the older style VPI DD table - even one for HW and it was a very nice machine. I have the new one on order already from pictures I've seen its smaller than the old drive. To get the same speed stability I have a hard time getting with any belt drive. For an example I made several experiments with belt drive units one was adding more than one drive belt - 2 was better than one 3 was better than two and 4 was again better than 3 this must be because there is some microscopic belt slip. Any one with a VPI Flywheel drive station should try more than one belt - you'd be surprised by its effect. https://pbnaudio.com/original-groovemaster/ Good Listening Peter |
Melm, No actually not - any mat will change the sound of a turntable setup, and I prefer the sound a copper mat produce. Im thinking about haven one made of Stainless Steel just to try that. Now lets talk about motors on the DD tables I am talking about, I restore Denon DP3000/2000/6000/7000/80 and DN308. The motors on these are substantially larger than any of the motors typically used on any belt drive http://www.hurst-motors.com/aabdirectdrive.html this link takes you to the first choice of belt drive manufactures. The first 4 on my list use almost identical motors, the 80 is even larger, and the DN308 motor is the size of a gallon paint can. https://pbnaudio.com/pbn-dp8/ - here you can see the motors on the first 4 and the DP80 which is 5.5" in diameter so you have come comparison. https://pbnaudio.com/pbn-dn308/ This link shows you the motor on the DN 308 - the Bezel that holds the platter and motor is 15.375" just to give you some comparison. Good Listening Peter |
Cleeds The DP80 is a fantastic machine, in its original form the only setback as I see it was the pot metal pan they and the other models I use as donors were mounted on. Once you get them out of that their stellar performance really shines through. Here is an example https://pbnaudio.com/pbn-dp80/ To me these machines sound much better than any belt drive which to me has a sluggish sound. Melm, That you postulate that you can hear the servo mechanism working , is probably because you want to - it does not mean its there. The same reason that people "hear" differences in Fuses etc, to me this is pure BS. They hear it because they want to hear it. As far as associate equipment used with these magnificent tables the list is long, currently I have in rotation 2 each DN308 one with a Triplanar U12 carrying a Lyra Atlas, the other one have a Origin Live Enterprise C Tonearm carrying a Lyra Olympos. A DP8- Professional with a SME 4.5 carrying a Ortofon A90. I got a EMT950 a few weeks ago - restoring that one now. Hopefully a Denon DP100 will be in the stable soon as well. https://www.facebook.com/peter.noerbaek/videos/10156654485509512/ We have by the way made 5 each DP7 tables for Lyra in Japan, three with the mighty SAT tonearm, and Two that are used in production with Auddio Technica tonearms on the right side Ikeda on the left side https://pbnaudio.com/pbn-dp7/ Good Listening Peter |
gochurchgo The PE Roadrunner was $400 - makes mine a bargain :-) The benefit from these tachometers are that you can actually see at what speed your TT is running. Good Listening Peter |
Goofy Your correct on mine it only display what speed your table is turning at. As did the Roadrunner, but it could “talk” to the Falcon power supply which corrected any speed irregularities as well as is possible on a belt driven table. I dont know much about the TD124 if it has an asynchronous AC motor it should work with it. As I mentioned above Sota is reintroducing the combination next month. Good Listening Peter |
