Send me your Portaphile V2, V2^2 and/or Maxxed and have it upgraded to OPA627’s. The upgrade includes: Replacing the three OPA8610’s with three OPA627’s and also replaces 6 metal film resistors. You will lose portable functionality but gain a killer desktop amplifier. An external power supply (not included) will be required as this will turn your Portaphile V2 into a desktop amplifier. External power supply must be capable of providing at least 18V’s DC, be a barrel type plug with center positive.