Thank you Evan. Great input and really gets me pointed in the right direction.

Just purchased used Penta III's. They are in excellent shape cosmetically and sound great. I am currently driving them with a 4000 music system. I have three questions I would appreciate input on; 1- What are the common repair concerns on the Penta's that I should be looking or listening for? 2- I want to upgrade to a 9000 music system. I can