Phone preamp question

High quality audio is always directly associated with high quality power supplies.

It's a very general statement. No offense intended, but I'm not sure a bare bones $250 Bellari phono preamp qualifies as high quality. In this case, switching out power supplies will probably not reveal much. Tube rolling in this scenario would probably make more sense when trying to upgrade audio performance. I've personally always loved Telefunken's myself. 

@thecarpathian 

I agree 100% with @russ69. It also depends on how loud you like to play your system. The Odyssey Audio Stratos' spec sheet does not specify an input sensitivity rating (that I could find), so it's hard to tell if 39 dB of gain on the Bellari will be sufficient for your systems needs. My guess is it will be. Make sure the Bellari is powered up first before powering up the speaker amp (if and when using speakers). In this scenario, I would also not allow a pair of headphones to be plugged into the Bellari when listening to speakers, as this may change the output impedance and output voltage of the Bellari (just to be on the safe side, as the Bellari spec sheet does not specify if when headphones are plugged in, the RCA outputs are muted). Speakers or headphones when using the Bellari, but not both at the same time is my recommendation. Let us know how it performs for you.    

@thecarpathian

the Bellari came with a custom and extremely robust separate power supply to use in place of the original, anemic wall wart. (Included)

I wonder if this has something to do with its performance?

Most definitely. High quality audio is always directly associated with high quality power supplies.

@sleepwalker65

I’m in agreement with the notion that a wall wart will almost always be inferior to a well-designed power supply.

I hear ya, but there are also those out there that make the argument that SMPS’ do a great job of isolating 60 Hz hum.

AUDIO MYTH - "SWITCHING POWER SUPPLIES ARE NOISY"

I don’t know if you’ve ever heard the Benchmark amp mentioned in the article, with your own ears, but I have, and to my ears, it is drop-dead amazing, with a distortion figure of 0.00016%. I think I saw a S/N ratio figure of -130 dB. Most audio manufacturers cannot even approach that. Some people prefer the harmonics of tubes. I love the sound of them too, but give me low distortion any day over tubes. If you ever get the chance to hear the Benchmark amp at CES, or a local audio show; definitely make it a priority.