AFAIK the only difference between the V1 and V2 are the tubes familys. Generally speaking 6 series tubes are more expensive, i cant speak for which sounds better as i've only ever used the 12 series. The same basic circuit was used in amps made by Indeed and Little-Bear, the latest versions of each have a switch to select between 6 and 12 series of tubes opening up a lot more options. (Indeed G2 / Little-Bear P-1). The P-1 was being auctioned off on ebay recently, i picked one up for $20. The latest version of these amps is currently the Indeed G3, though i expect Little-Bear will release their version shortly.