This is a used ZROCK2, Number 001 owned by its creator, Steve Deckert.  It has been factory refurbished with a free lifetime warranty to the winner.
 
This unit is wired for 120 Volts 50/60 cycles.   (For 230/240 volt operation the unit will have to be used with a 100W step down transformer). 
 
It comes with a new hand-selected NOS 12AU7 that has been testing in the unit for low noise, channel balance and low distortion.
 
This is a 2009 unit so the input voltage is limited to industrary standard 2 volts.  It can take higher, but distortion will increase past 2%.  This unit was updated with large beeswax caps, and level 1 and level 2 anniversary mods with internal tube regulation.
 
Has minor scratches from use.  Sounds killer!