SOLD - The world's first bank-switching, microprocessor-controller, ultracapacitor-based, ultra-low-noise external linear power supply. Details are here:https://uptoneaudio.com/products/ultracap-lps-1
I was using it on an ultraRendu, which it really improved. Sold the ultraRendu and all my gear is 12V so I cannot use this now. Price is fair and firm at $315 including PayPal fees and Fedex Ground shipping in CONUS. Uptone is sold out until sometime in January.