Mosin's mellemhjulsprojekt:
Mosin:
"It is an idler made from Baltic birch with a thin layer of acrylic (persplex for you Brits) on the top and bottom surfaces (all four). The vertical areas are many coats of paint that match the horizontal parts perfectly. Blending in the paint was the difficult part, but it all worked out. The acrylic was rubbed out, so that it appears to be the same material. I wanted a finish that looked like what you would find on a good piano, and it can be done with enough effort."
"It began as a Lenco, but soon grew into its own animal. There are some bits of a Lenco left, like the motor, but they have been heavily modified. Even the idler is scratch-built because I didn't like how Lenco did it, although the idea of an idler riding on the underside is a good one."
"only a couple of modified Lenco parts remain in there, and no others from any other brand. I could ditch them, actually. In fact, it deviates from a Lenco so far that I really can't call it a Lenco project, either. It's just an idler. I suppose the main thing it has in common with the Lenco is that the idler runs on the bottom of the platter, rather than the rim."
"I scrapped all of Lenco's linkage. Mine is a single articulated arm. The spindle and bearing are also highly modified."
"The bottom part is actually a separate isolation base that was tuned to this particular turntable. It is constructed from seven materials, and weighs virtually the same as the top part. The two are separated by three pucks made of a slightly compliant extruded material. The feet on bottom are rubber ones that are adjustable."
"The armboard is the same material, and is made for the quick interchange of setups without any tinkering around with alignment, VTA, VTF, etc. Changes can be made in around one minute. Styles of the modules differ slightly to accommodate tonearms which have their own RCAs, etc. The armboard modules mount on a one kilogram stainless steel mount that is bedded into the body of the plinth. A spindle ground is integral."
"The lever on top is also stainless steel, and a flip of it turns on the motor and actuates the idler wheel. The affair is a single articulated arm which has been treated to avoid bad resonances. Because of its simplicity, the turntable is 33 1/3 only."
"The tonearm module is a composite made of Baltic birch and acrylic...persplex for you Brits. ;) Anyway, it has metal built into it, so that the screws bottom out evenly, and it also has a built-in grounding system that allows for a ground from the spindle. What you see is one type of module, and it is the one for the bulk of the tonearms around. There are a couple of more, too. For example, a module for an SME or Technics EPA-500 might have a simple notch at the bottom, rather than connectors on back because the connectors are made into the tonearm itself. The whole purpose behind the module concept is to allow the user to quickly change between tonearm setups without fiddling with alignment, VTF, VTA, etc. The change takes around one minute. To the original question, I consider armboard material to be of less influence than many guys believe. The interface is key, so my modules are fastened to a two pound stainless steel arm module mount that is glued inside the plinth. There is a simple layer of cork inside the mount area for damping...probably not needed."
"The gap is because the turntable is actually two pieces that are almost the same weight. The bottom is an isolation platform that I made to integrate with the main plinth. It has an internal construction that combines seven different materials, and is tuned to the localized weight areas of the main piece...as best I could without special measuring devices. The two pieces are separated by three feet made of an extruded foam material. The bottom has four rubber feet that adjust. All sides are finished, not just what you see. Also, the gap does provide ventilation."
"There are internal tweaks that I won't show. A provisional patent is for the idler assembly because it is a new thought. Although I built this turntable for my own use, I figured I should protect it. Anyway, the project exceeded my expectations, and it is very quiet. It is the antithesis of a springy. The sound is best described as forward in presentation, and with the immediacy one would expect from an idler without any of the associated noise."
"The platter has a composite top....I tried a bunch of them with this project, and I have come to some conclusions that I never expected. In my opinion, the platter is absolutely critical to a turntable's sound."
"It's a 65lb. (28.5kg.) idler."
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