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I just ran some FFTs comparing a bench linear supply to the Meanwell P25A both with and without the 5V preload. There was no discernible difference between the three so I see no harm in removing the resistor if the heat is a problem.

100°C is indeed hot but not unexpected as the resistor is dissipating about 2.5W. I do think it is a bit hot for a plastic case. I made measurements on the P25A some time ago - the measurements are of the DC rails and not the preamp. +15.32, -14.95 measured with 5V loaded in 500 mA. (10Ω) V+...

I'm not sure the preamp itself really cares whether its left on or not. There are no electrolytic capacitors in the signal path that would need to be constantly-formed. So yes its OK to leave on. If you switch the preamp on or off with the Meanwell supply only the DC connections are being...

It is a DB-9 pinned out like this:

Thank you everyone for your support! I'm glad to see so many units packaged and being used. This is my preamp in a Hammond enclosure. I used "D" connectors in order to quickly switch preamps between MC and MM. The 9 pin Ds are pinned out such that if one were to absent-mindedly plug the...

Variable Termination and Connection Diagram for the Flat Balanced Input Moving Coil Phono Preamp I'm frequently asked how to do switchable termination for the Flat Moving Coil Preamp The simplest termination scheme uses a 6 pin female connector plugged onto the termination jumper header. This...