With all joking aside, I have noticed some difference in the first 15 hours of use, mostly in smoothness of the treble and tightness of the bass. I do not know if the unit was burned in at all prior to shipping, but Todd told me the 307 tubes would require some burning-in before perfoming their best.
I also noticed that you have to pay attention to the connector at the top of the 307's. If this is loose, then there is a mechanical hum created. However, when this is in proper position, this is the most dead-quiet tube amp I have ever heard.
Now where is Riceboy with those R-10's?!?
