Well addressing it at the source is always best but then you need something like the TX1000. A bit more challenge to DIY today. Point is though that the major problem is solved also with the above solution.
I'm not sure the problem is solved. the DD used there is good at accelerating and less good at braking. Plus add in the accuracy issues of measuring eccentricity at the pivot, where there is least movement and remain unconvinced it is as good as Scott's optical method.
There is an interesting optical method for measuring eccentricity that drops out from the mods RayK did on his linear tracking servo arm. I wonder if that could be adapted for this...
There is an interesting optical method for measuring eccentricity that drops out from the mods RayK did on his linear tracking servo arm. I wonder if that could be adapted for this...
So he played a test record with sine tones. You just need a DD turntable with a powerful motor, a frequency reference and a sophisticated PID controller to get a test tone at some constant frequency. I doubt, though, that this will be practical with usual records of musical content. So, what's the point?
Of course you probably could involve Melodyne or something like that 🙄...
Best regards!
Of course you probably could involve Melodyne or something like that 🙄...
Best regards!
The easy way is to draw a pencil line along the radius that corrects the wow when the record is pushed against the spindle along that path. Tight spindles are inferior by design😛
I wonder if, in normal music programme, it's possible to deduce musical key and pitch accuracy just from the first 2 mins of a recording? And if so, how accurately?
Spectrum will be skewed toward specific frequencies within a key and permissible harmonisations within it. First step might be a 'key detector'. I know quite a few musicians who would benefit from one of those, with a big red display ;-)
LD
Spectrum will be skewed toward specific frequencies within a key and permissible harmonisations within it. First step might be a 'key detector'. I know quite a few musicians who would benefit from one of those, with a big red display ;-)
LD
Probably easier to look for the 1/1.8 Hz left in the signal from the cart. the phase gives the axis if you pick some reference point. The lead in groove might be enough.
Brilliant from the mechanical/servo point of view but nonsense in the intended application.
The heavy rotating mass has a lot of inertia, **on purpose** and the mechanical time constant is way longer than what 33 RPM implies.
So the servo is constantly fighting a rotating system mechanically *designed* to, beyond having constant speed, *resist* speed variations.
The proper solution, of course, is to fill original hole (epoxy?) and redrill properly.
The heavy rotating mass has a lot of inertia, **on purpose** and the mechanical time constant is way longer than what 33 RPM implies.
So the servo is constantly fighting a rotating system mechanically *designed* to, beyond having constant speed, *resist* speed variations.
The proper solution, of course, is to fill original hole (epoxy?) and redrill properly.
I do not have a single record that is not off center. Without a solution full performance cannot be realized whether it employs additional electronics or the simple one I've outlined, the major detriment being AS which is effective on one half revolution when it's off center. The sonic difference is easily detectable. So because of the tolerance in the record, my initial statement is actually true in practice.
I have a much better solution. I have a removable spindle on my record player. In spec and adjustable all in one. Does that make mine superior by design?
😛
😛
To go the whole way by automatic pushing the record to correct position, one would need some kind of small motor and a rod pushing the record in small steps, with the tonearm movement or 0.55 Hz signal as guide. This in turn requires a bit larger hole than the spindle and a slippery mat (felt mat) allowing the record to move during push. This would essentially be the Nakamichi Dragon method.
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