Helping a DC motor

I've got a turntable in the house, and I'm waiting on the tonearm to be finished/shipped. I'm trying some different bearing oils and power supplies to establish a baseline of performance.

Measuring wow and flutter is not well standardized, but I have used some apps like RPM in the past to establish a baseline so I could quickly check and see if belt slippage or other possible issues are deteriorating performance. 

My power is pretty basic—20 amp dedicated line with a ZeroSurge unit for filtering and protection (big caps rather than MOV). I've got a power strip running off the ZeroSurge with a bunch of source components and wall warts. 

I'd like to improve the power to the table with the goal of making it easier on the motor and possibly improving the measured wow and flutter. Maybe the cheapest way to wade in is to add a ferrite core, but what size, what materials, how many wraps, where on the power wire do I place it? Seems like too much experimentation. I don't have O scope. Are there any basic guidelines or ways to measure that I might not know of?

The power supply look like a basic switching wall wart—12V, 420mA. This low current appears to be be below what most LPS solutions can provide, and I'm thinking it needs to be current limiting as the back of the table specifies "less than 500mA".

It has a speed selector switch and two trim pots for 33 and 45. 

Seems to start a little fast then settle down. 

Edited by patientot - 07 Jul 2022 at 1:45pm

jupiterboy wrote: [ Might have to set up a Windows OS on a partition to run software. I can't tell if the shaknspin app is Apple friendly. My take on the phone apps is that, yes, the w&f is largely useless. That said, I've center drilled a sponge the size of my phone, so that goes over the spindle and under the phone. I'm getting repeatable results, even if less than accurate, so it is a sort of baseline. I still think the phone weight can't be centered, so it probably punishes some bearings more than others.  Thanks for the leads.