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Тонарм VPI JMW-12 3D

Код товара: 29177
Бренд: VPI
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Тонарм VPI JMW-12 3D

In 1995, Harry Weisfeld's son Jonathan was killed in an automobile accident. Jonathan was a charismatic young man whom I had come to know—a genuinely gifted artist and musician who, at the time of his death, was helping his father develop the tonearm that would be named for him: the JMW Memorial Arm. The design of the original JMW Memorial Arm focused on providing easily adjustable and repeatable VTA and SRA via a massive threaded tower that bolted to the plinth. The bearing point, on the other hand, sat near the end of a relatively long and not particularly rigid metal platform cantilevered off the VTA/SRA tower.

During VPI's ongoing refinements of the JMW arm following Jonathan' passing, fellow Stereophile reviewer Bob Reina visited, to listen to the JMW Memorial in a three-way shoot-out with two other unipivot arms: the Graham Engineering 2.2 and the Immedia RPM. The Immedia easily ran away with the prize, Bob bought one, and uses it to this day. I set up his retipped Koetsu Urushi cartridge a few years ago, and his RPM2 still sounds great; the ingenuity of its design is still impressive.

The Immedia's designer, Allen Perkins, concentrated on producing an efficient and direct vibrational path to ground from arm to plinth by tightly bolting to the armboard the threaded bearing-cup support rod that's first adjusted so that the pivot point is in the plane of the stylus and groove. Another bolt containing the bearing point is screwed from above into the arm pivot's massive housing, to sit in the cup. While adjusting the upper threaded bolt up or down changes the vertical tracking angle (VTA) and stylus rake angle (SRA), the point and cup themselves don't move, which means that the pivot point remains, at all times, in the stylus/groove plane of play. The benefits of this should be obvious, particularly when playing warped records.

All three unipivot designs (Graham, Immedia, VPI) were kept stable with mass that lowered each arm's center of gravity below the pivot point—much as a tightrope walker uses a long, heavy balance pole. The Immedia had a flared pivot housing in the shape of a bell. The Graham used a pair of weights attached to threaded rods placed low on the bearing housing. The JMW used a heavy, asymmetrically weighted, rotatable metal ring isolated with an O-ring.

On the original Immedia arm, azimuth was set by rotating an asymmetrically attached counterweight. Later, this was replaced by a decoupled counterweight assembly, to which was attached a perpendicular threaded rod weighted at each end. The effective mass could then be adjusted from side to side by screwing the rod in one direction or the other, much as the Graham's azimuth was set by unthreading one weight or the other away from the bearing housing.

Параметры

  • Тип поворотный тонарм
  • Производитель VPI
  • Внешний вид тонарма прямой
  • Длина тонарма, в дюймах 12
  • Эффективная масса, г 10.5
  • Страна (главный офис) США
  • Регулировка тонарма по высоте есть
  • Антискейтинг есть
  • Съёмный шелл нет

Фото Тонарм VPI JMW-12 3D

Тонарм VPI JMW-12 3D

Категория: Тонармы, Бренд: VPI

In 1995, Harry Weisfeld's son Jonathan was killed in an automobile accident. Jonathan was a charismatic young man whom I had come to know—a genuinely gifted artist and musician who, at the time of his death, was helping his father develop the tonearm that would be named for him: the JMW Memorial Arm. The design of the original JMW Memorial Arm focused on providing easily adjustable and repeatable VTA and SRA via a massive threaded tower that bolted to the plinth. The bearing point, on the other hand, sat near the end of a relatively long and not particularly rigid metal platform cantilevered off the VTA/SRA tower.

During VPI's ongoing refinements of the JMW arm following Jonathan' passing, fellow Stereophile reviewer Bob Reina visited, to listen to the JMW Memorial in a three-way shoot-out with two other unipivot arms: the Graham Engineering 2.2 and the Immedia RPM. The Immedia easily ran away with the prize, Bob bought one, and uses it to this day. I set up his retipped Koetsu Urushi cartridge a few years ago, and his RPM2 still sounds great; the ingenuity of its design is still impressive.

The Immedia's designer, Allen Perkins, concentrated on producing an efficient and direct vibrational path to ground from arm to plinth by tightly bolting to the armboard the threaded bearing-cup support rod that's first adjusted so that the pivot point is in the plane of the stylus and groove. Another bolt containing the bearing point is screwed from above into the arm pivot's massive housing, to sit in the cup. While adjusting the upper threaded bolt up or down changes the vertical tracking angle (VTA) and stylus rake angle (SRA), the point and cup themselves don't move, which means that the pivot point remains, at all times, in the stylus/groove plane of play. The benefits of this should be obvious, particularly when playing warped records.

All three unipivot designs (Graham, Immedia, VPI) were kept stable with mass that lowered each arm's center of gravity below the pivot point—much as a tightrope walker uses a long, heavy balance pole. The Immedia had a flared pivot housing in the shape of a bell. The Graham used a pair of weights attached to threaded rods placed low on the bearing housing. The JMW used a heavy, asymmetrically weighted, rotatable metal ring isolated with an O-ring.

On the original Immedia arm, azimuth was set by rotating an asymmetrically attached counterweight. Later, this was replaced by a decoupled counterweight assembly, to which was attached a perpendicular threaded rod weighted at each end. The effective mass could then be adjusted from side to side by screwing the rod in one direction or the other, much as the Graham's azimuth was set by unthreading one weight or the other away from the bearing housing.

Параметры

  • Тип поворотный тонарм
  • Производитель VPI
  • Внешний вид тонарма прямой
  • Длина тонарма, в дюймах 12
  • Эффективная масса, г 10.5
  • Страна (главный офис) США
  • Регулировка тонарма по высоте есть
  • Антискейтинг есть
  • Съёмный шелл нет
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    Краткое описаниеIn 1995, Harry Weisfeld's son Jonathan was killed in an automobile accident. Jonathan was a charismatic young man whom I had come to know—a genuinely gifted artist and musician who, at the time of his death, was helping his father develop the tonearm that would be named for him: the JMW Memorial Arm. The design of the original JMW Memoria...
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