@armstrod Thanks! Perfect. I agree re: the stock umbilical. It's not really fitting of a piece of gear at this price point. IMO the upgraded one should just be the standard for something like this, but alas.
@theflattire thanks for your insight! I tested a few rectifiers on my SET amp and saw pretty big changes in sound quality overall, so I would be surprised if I didn't hear any difference with doing it with the pre-amp. However, it may be less of a difference between tube types versus the non-upgraded power supply & the tube rectified in general. I guess I will find out!