What you should be looking for is the reactivity of the loop for phase change. The tracking is just the phase relationship, and you’re not going to see anything but gross instability on a scope.
Here are 3 wav files for different platters recorded with Audacity and a Focusrite Solo. Test point F was used and recorded at 44.1 32bit.
Either the Focusrite presented too much load, you introduced a ground loop, or both. For a MKII I use a 10K R in series with TP F and a battery field recorder (Tascam DR40). Watch the signal on your scope before the R for integrity.
Oops I actually zipped the incorrect files as I had done a number of measurements attempting to get the signal in audacity stable. I initially used a 10x scope probe but this caused too much attenuation for the Focusrite.
I have only attached the OEM and SS platters as there is little difference between SS and GM/Delrin in mass.
I have only attached the OEM and SS platters as there is little difference between SS and GM/Delrin in mass.
You're right the Focusrite (FR) was doing something weird. I wasn't watching the scope trace as I recorded the wav's. The trace was stable then threw a wobbly.
Check this measurement what I did was use a 10dB attenuator to place a load across the FR. The FR is no longer loading the scope trace.
What SW package are you using to analyse the trace?
Check this measurement what I did was use a 10dB attenuator to place a load across the FR. The FR is no longer loading the scope trace.
What SW package are you using to analyse the trace?
That last one is the Gunmetal platter 7.5kg
wav 1 in 1747 was the OEM so this was a suspect capture.....
Thanks for doing the analysis......
wav 1 in 1747 was the OEM so this was a suspect capture.....
Thanks for doing the analysis......
Your post #1719 has a measurement of the OEM for comparison.
The objective was to verify the additional mass of the platter had no affect on rotational stability.
The objective was to verify the additional mass of the platter had no affect on rotational stability.
The discussion since posts #1683, #1700 has been about determining the audible effect of replacing the mk2 OEM platter with SS, gunmetal, Delrin/SS. No claims of any effect on speed stability were made. The suggestion by others that the heavier platters had a negative effect on speed stability, is not true, based on Warrjon's FG captures and JP's analysis.
Anyone with an OEM platter can compare their data with the wavs provided by Warrjon for heavier platters.
I don't see any dancing.
Files with generic names, weird discontinuities, and incomplete tests; comparisons should be done on the same unit as there are untold variables that can affect things in ways that can't always be anticipated. This is basic hygiene.
My bench has been full of SP10's being repaired so no room to do FG W&F testing. Sorry just been busy building and repairing SP10 stuff...
Bon was kind enough to capture 3150Hz tone from his new Vinyl Check test LP, which BTW looks pretty good, way better than the Ulimate Analog Test LP W&F track.
Keep in mind that his 10R has a different cartridge to his mk2, which would account for the difference in W&F between the two.
In order of pictures
10R, mk2 OEM, mk2 Stainless/Delrin.
Bon was kind enough to capture 3150Hz tone from his new Vinyl Check test LP, which BTW looks pretty good, way better than the Ulimate Analog Test LP W&F track.
Keep in mind that his 10R has a different cartridge to his mk2, which would account for the difference in W&F between the two.
In order of pictures
10R, mk2 OEM, mk2 Stainless/Delrin.
Attachments
This is what I've busy toiling over. Removing the motor from the aluminium chassis and mounting it in a bentonite plinth.
An SP10mk2 Signature with a long list of modifications.
Resin bentonite plinth.
Remote motor mounting.
Motor redrilled for 3 mounting bolts.
Modified motor rotor to increase rigidity.
Bearing brace.
Gunmetal / Delrin platter.
EPA100
New brass CW stub.
Threaded Stainless CW with locking ring.
Variable viscous damping.
Upgrades to come
New GM / Delrin platter with thicker Delrin
Further motor damping modifications.
Servo LTA
An SP10mk2 Signature with a long list of modifications.
Resin bentonite plinth.
Remote motor mounting.
Motor redrilled for 3 mounting bolts.
Modified motor rotor to increase rigidity.
Bearing brace.
Gunmetal / Delrin platter.
EPA100
New brass CW stub.
Threaded Stainless CW with locking ring.
Variable viscous damping.
Upgrades to come
New GM / Delrin platter with thicker Delrin
Further motor damping modifications.
Servo LTA
Attachments
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