upgrades for your amp/preamp

Here is a list that may help you out a little.

Forrestc, thanks for your response. I am interested in advice and wanting to read diy literature. Who makes the best parts and where can I buy them. Thanks again

Orlando, you need clarify your question.

Obviously you are interested in upgrading or updating your amp and preamp, but are you wanting to do it yourself and need a source for parts or advice, or do you want to find someone with the necessary skills do the upgrades for you?