@erik_squires I understand what you're saying and is partially why I posed the question. Below is Backert Labs justification for the V-Caps in the power supply:
"At Backert Labs, all of our preamplifiers use the new GreenForce™ power supply. Because GreenForce is totally unlike previous power supplies, Bob Backert was granted a patent on GreenForce in 2013.
For those who are familiar with electronics, an example of the surprising quality of GreenForce is that the capacitors used to power our Rhumba preamp total less than 1 uF (one microfarad). Most power supplies for a similar preamp would use hundreds, or 1000’s of microfarads.
Because so little capacitance is needed, GreenForce is the only power supply in the world that can run a stereo component entirely on PTFE capacitors such as V-Cap™ capacitors, which we feel are the finest type of capacitor for a power supply available today."
And another excerpt:
"The heart of any power supply is its capacitors. Similar to batteries, capacitors provide the power for your equipment to operate.
The GreenForce power supply employed in all preamps by Backert Labs is unique, in that it allows the use of extremely high quality capacitors to run the power supply.
In our Rhumba and Rhumba Extreme models, the GreenForce power supply uses very high quality polypropylene capacitors for extremely linear and nimble response.
In our Rhythm models, the GreenForce power supply uses the costly V-Caps™ copper/PTFE capacitors. Online capacitor comparisons such as The Great Capacitor Shoot-Out tend to rank V-Caps in first place (and that is with the tin version of V-Caps, rather than the upgraded copper version that we employ).
The Rhythm 1.3 preamplifier is the only audio component in the world with an all-V-Caps or all-PTFE power supply.
The results: Incredibly fast transients. Tight, accurate bass with visceral texture and punch. Extremely accurate timing. Incredibly fast dynamic changes — dynamics that really tell the story of what is on your source material."