The most prominent feature of the Oasis turntable is most probably its direct drive mechanism. In their never-ending search to improve sound quality, Brinkmann did not stop short of evaluating different drive mechanisms or other alternatives such as belts of various consistencies. They quickly discovered, however, that belts, for example, impart a fundamental sonic characteristic on the sound, and therefore decided to forgo them altogether for this new model. As it turns out, the platter of the Oasis is driven directly instead of with a belt.
The drive mechanism consists of a ring shaped permanent magnet contained in the platter’s bearing and four air-cored inductors on the Oasis’s chassis plate. These inductors are adjusted and driven with utmost precision to different phase angles. Thus, the ensuing magnetic field rotates the platter. Well aware of the reason for the bad reputation and uneasy sound of the direct drive turntables of the 1970s and 1980s, Brinkmann resisted tight regulation of the direct drive mechanism. Taking advantage of the many years of experience and insight gained from manufacturing their own “big” turntables, Brinkmann used a precision bearing that is capable of smoothing out the drive’s miniscule speed variations. This results in a rotational smoothness hitherto unimaginable with “classic” direct drive mechanisms.
Brinkmann’s clamping mechanism allows for quick and precise adjustments, without any play, of the aluminum arm base for 9 to 10.5-inch length tonearms. The platter is made of a special resonance-inhibiting alloy of aluminum, copper, magnesium and other materials. A crystal glass platter top layer and a screw-down record clamp allowany vibrations to be quickly absorbed by the platter. Finally, three height adjustable spikes allow for a precise leveling and optimal contact of the turntable to your choice of platforms (Brinkmann recommends HRS’ M3 Isolation Base).
The RöNt II tubed power supply is the ideal completion for the Oasis.
The Oasis motor’s stator consists of four specially designed field coils, which are mounted concentrically with high precision around the platter bearing. Based on listening and tuning sessions, Brinkmann decided to forgo the typical 90-degree mounting angle in favour of a non-standard 22.5-degree raster, which, due to the magnetic fields overlapping, further reduced cogging. The motor’s rotor also acts as the sub-platter and carries a magnetic ring with 8 poles on its underside.
The drive mechanism, based around Hall sensors and an encoder disk, is designed in such a way that there is just enough power to bring the 10 kg heavy platter up to 33 ! e rpm in about 12 seconds. Conversely, only a minimal amount of energy is actually necessary to keep the rotational speed at a constant. While the drive mechanism is indeed direct, power is actually transferred without any contact. This soft coupling via a low power magnetic field translates into a silent drive, which reduces cogging further. One of the main attributes behind the sound quality of the “Oasis” has to do with their proprietary motor control. It works proportionally, i.e. it transfers just enough energy to the motor for it to remain at constant speed. Conversely, due to an ultra low-friction bearing, only a small amount of energy is actually necessary to keep the motor at constant speed. Previously available regulators typically work disproportional and rather abruptly: they speed up and slow down the motor very rapidly when necessary.
|Dimensions (WxDxH)||520 x 400 x 125 mm|
|Platter||weight 10 kg, Ø 316 mm, height 50 mm.|
|Platter surface||planar polished crystal glass (recessed mounting)|
|Tonearm base||available for 9…10.5” tonearms (arm mountings available for virtually any tonearm),|
|easy and quick exchange and adjustments are provided via a collar system.|
|Woodplinth||maple, cherry high gloss, makassar high gloss oder rosewood high gloss;|
|other wood finishes and colors available upon request.|
|Included in delivery||turntable, screw-down record clamp, power supply, tools|
|Options||additional arm bases, dust cover|
The turntable comes with its own transistorized power supply, but is best driven by the optional RöNt II tube power supply, allowing for the clearest mains source available. Normally the motor is driven from the same supply that feeds the heating of the bearing. When the RöNt II tube power supply is switched in, the motor is automatically driven from this power supply, the transistorized one remains for the heating.