Re: Re: One more DIY TT is born
Constraint Layer Damping is extremely efficient method to absorb vibration by placing a viscous layer (sorbotane in my case)between two rigid ones (acrylic and aluminum on upper plate).
Of course, for unsuspended TT the whole assembly rigidity is a must (my upper acrylic plate is directrly coupled to subplatter by means of three bronze cones).
Note, the central pin is decoupled from bearing for sake of bearing-induced vibrations isolation.
Well, in terms of isolation from external and stylus-induced vibration it is close to perfection (IMHO), it means deep black background without a shadow of HF roll-off.
Teres motor/controller does extremely good job: piano sounds are rock stable, no traces of wow.
As for tonearm/cart synergy, I feel my high comliance Grado Statement Sonata is not completely happy with Ladegaard's lateral high mass: occasionally a low frequency resonance-like artefacts (call is distortions) may be heard on certain records (complicated orchestral music). I think I shall give Denon 103 a try (looks like a general consensus here) - stay tuned...
rif said:
Constraint Layer Damping is extremely efficient method to absorb vibration by placing a viscous layer (sorbotane in my case)between two rigid ones (acrylic and aluminum on upper plate).
Of course, for unsuspended TT the whole assembly rigidity is a must (my upper acrylic plate is directrly coupled to subplatter by means of three bronze cones).
Note, the central pin is decoupled from bearing for sake of bearing-induced vibrations isolation.
BobM said:
Well, in terms of isolation from external and stylus-induced vibration it is close to perfection (IMHO), it means deep black background without a shadow of HF roll-off.
Teres motor/controller does extremely good job: piano sounds are rock stable, no traces of wow.
As for tonearm/cart synergy, I feel my high comliance Grado Statement Sonata is not completely happy with Ladegaard's lateral high mass: occasionally a low frequency resonance-like artefacts (call is distortions) may be heard on certain records (complicated orchestral music). I think I shall give Denon 103 a try (looks like a general consensus here) - stay tuned...
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bearing
Conventional type bearing: bronze housing, SS spindle, SS ball, delrin thrust plate. Lower end of the housing is closed by threaded plug with O-ring sealing, I just tried to keep manufacturing simplier. The bearing is placed well within the platter, in order to keep platter CofG closer to the bearing surface geometrical center.
Aircraft grade hydraulic oil of low viscousity is used, since the viscous friction is substantional, due to very tigh fit and large bearing surface area.
Conventional type bearing: bronze housing, SS spindle, SS ball, delrin thrust plate. Lower end of the housing is closed by threaded plug with O-ring sealing, I just tried to keep manufacturing simplier. The bearing is placed well within the platter, in order to keep platter CofG closer to the bearing surface geometrical center.
Aircraft grade hydraulic oil of low viscousity is used, since the viscous friction is substantional, due to very tigh fit and large bearing surface area.
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