@gmosley, you may have found a treasure.
I have some experience with Eagle amps, but first listen to Ralph. As usual he offers sound advice.
For background, long ago I owned an Eagle 2A amp which was very musical and powerful. After that I had a pair of 400 mono blocs. However they sat in storage a few years before I sold them. I tested them briefly before selling them. Unfortunately the new owner then damaged his speakers, almost certainly because of filter cap failures.
Back when the 7A was a current product a friend bought one to drive his B&W 801s. Iverson told him there was no on/off switch because he couldn’t find one that didn’t burn out quickly with use, so simply plug and unplug the amp! My friend soon tired of that so found a knife switch to put inline on the power cord.
A guy who worked for Iverson later set up a repair/modification service for Electron Kinetic products but may no longer be in business. I suspect schematics are not available.
Since you may not be familiar with Iverson and Electron Kinetics, search for an article from TAS on his strange disappearance, a truly weird story.