This looks like it could be based on the BCL/M-Stage design.
Indeed, they use SMD opamp wich is a downside.
I bet they put a smd OPA2604 on the 701 flavored amp.
PS: search for "purepiper" on ebay to see the other models.
Edited by GaToMaLaCo - 8/23/12 at 10:10am