Well, based upon all of the recent preamp threads, and specifically relating to some talking about comparing the construction of various units, I thought I would take this opportunity to take a peek inside my preamps and share what I found. It was a sunny day here in Ohio, and I like to let them out for some fresh air anyway! [Check the link below to a stopgap fix. Sorry for the inconvenience.] Enjoy! Tom. P.S. One thing I did note is that the 680 is one heavy mo-fo! I have heads that weigh less! Nice construction, for sure.