VCO tuning stability between Rev4 P5/P10 and P6/OB6?

VCO tuning stability between Rev4 P5/P10 and P6/OB6?
« on: June 16, 2021, 12:12:00 PM »
If the Prophet 6 and Prophet 5/10 Rev4 are both basically almost identical and fully 100% analog (not including the digital effects on the P6/OB6), then what phenomenon has been added to P6/OB6 that makes their VCO’s so stable and ready to play almost immediately after power-on? …. un-like the P5/10’s VCO’s that have to be warmed, calibrated and tuned for some length of time before the oscillators are stable and the re-tuned periodically.

Please clarify. 
Thanks,
P5 Rev 3.3/P5 Rev 4 (w/Expansion board)/OB8/Jupiter 6/Juno 60/MKS80/MKS70/CP80/S80/AN1x/SK30/Motif XS Rack/CS6R/Crumar DS-2/Performer/ARP Axxe.

LPF83

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Re: VCO tuning stability between Rev4 P5/P10 and P6/OB6?
« Reply #1 on: June 16, 2021, 04:19:40 PM »
If the Prophet 6 and Prophet 5/10 Rev4 are both basically almost identical and fully 100% analog (not including the digital effects on the P6/OB6), then what phenomenon has been added to P6/OB6 that makes their VCO’s so stable and ready to play almost immediately after power-on? …. un-like the P5/10’s VCO’s that have to be warmed, calibrated and tuned for some length of time before the oscillators are stable and the re-tuned periodically.

Please clarify. 
Thanks,

Are you sure you didn't read about vintage P5s?   My P10 is ready to play immediately and is always pretty much in perfect tune.  I tend to keep the temperature very stable in my house.. my studio room might vary by 2-4 degrees farenheit at most.   I would expect temperature variance to be the biggest factor in tuning instability (assuming nothing else is wrong), and even that should level out over time with multiple calibrations.

For vintage P5s its anyones guess -- the old machines ran hotter so the machine itself is going to create enough temperature variance to making stable tuning a bigger challenge.
Prophet 10, OB-X8m, Prophet 6, OB-6, 3rd Wave, Prophet 12m, Prophet Rev2-16, Toraiz AS-1, Pro 2, Virus TI2, Moog SlimPhatty, Hydrasynth desktop, Korg Minilogue XDm, Roland JP-8080, Roland System-8, Roland SPD-SX SE / Octapad, Maschine, Cubase/Ableton/Akai MPC

Re: VCO tuning stability between Rev4 P5/P10 and P6/OB6?
« Reply #2 on: June 16, 2021, 07:57:02 PM »
I would think that the P5/10 Rev 4 uses the same type of Tuning Calibration Index Table system that P6 uses... since it came out after P6.  But maybe it doesn't?

Here's a detailed article with findings of the Tuning Calibration and Indexes, as implemented on P6:

https://www.presetpatch.com/articles/Prophet-6-and-OB-6-Tuning-Calibration



OB-X8, Pro 3, P6, Rev2, Take 5, 3rd Wave, Deepmind, PolyBrute, Sub 37
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Re: VCO tuning stability between Rev4 P5/P10 and P6/OB6?
« Reply #3 on: June 17, 2021, 06:52:42 AM »
I would think that the P5/10 Rev 4 uses the same type of Tuning Calibration Index Table system that P6 uses... since it came out after P6.  But maybe it doesn't?

Here's a detailed article with findings of the Tuning Calibration and Indexes, as implemented on P6:

https://www.presetpatch.com/articles/Prophet-6-and-OB-6-Tuning-Calibration

Hey creativespiral, thank you for that excellent information.  Good stuff to know.
P5 Rev 3.3/P5 Rev 4 (w/Expansion board)/OB8/Jupiter 6/Juno 60/MKS80/MKS70/CP80/S80/AN1x/SK30/Motif XS Rack/CS6R/Crumar DS-2/Performer/ARP Axxe.

Re: VCO tuning stability between Rev4 P5/P10 and P6/OB6?
« Reply #4 on: June 17, 2021, 04:41:20 PM »
My P6 never seemed to drift much at all, though it lived in a very temperature-stable room. My new Prophet 5 needs tuning quite frequently, as it goes noticeably out. I've seen its internal temp range from 35º to 44º, so can't say I'm surprised!

« Last Edit: June 17, 2021, 04:43:49 PM by Ant of 12047 »