J ai retrouvé quelques archives de VPI :
VPI HW19JR All turntables must be isolated from the outside world. The Jr. uses sorbothane as the isolation material. The sub-chassis is set upon four sorbothane pucks that keep a large percentage of motor noise and acoustic feedback from reaching the platter and cartridge.
The Jr. uses the same drive motor as the MK. III, and MK. IV,
VPI HW19 The sub-chassis is suspended on heavy springs at the corners, yielding a suspension resonance of around 5Hz. The springs are damped by the tried and true method of stuffing their insides with floppy foam plastic, which makes for a suspension that combines good vibration isolation with a high degree of stability. It jiggleth not! The panel is made of what appears to be ½" particle board, and screwed to the underside of this is a heavy steel sheet with folded edges for added rigidity. The whole suspended assembly weighs 24 lbs! The AC synchronous motor is attached to the base, not to the floating platform, and is coupled to the platter via a thin neoprene belt.
VPI HW19 mk2 Stronger springs (less weight than original on the HW-19)
VPI HW19 mk3 This rigid, highly damped subchassis system is then floated on four concentrically wound springs for improved vibration isolation, and a more open and airy soundstage. The entire floating system uses damping in the springs to control random motion. Upgrading to the Mk. III subchassis results in tighter bass, greater detail retrieval, and a lower feedback level.
VPI HW19 mk4 All of this would be irrelevant if the turntable suspension was not up to the task. In the Mk.IV, we borrowed the suspension springs from the TNT and floated the entire assembly at 2.5 Hertz. The Mk.IV is very resistant to all forms of acoustic feedback and environmental noise.
@+ @lain
-- 28 Déc 2019 à 13:26 --
19 Jr
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19 mk2
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19 mk3
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