Well I've joined the club here with this Icon Audio headphone amp. I found a lightly used standard model from a retired man who is really downsizing his system after a life long love affair with audio. After reading over the thread, I went ahead and brought a set of Mundorf Supreme Mcaps, silver/oil caps to upgrade. I have the amp at a respected amp repair shop having the caps being soldered in and having the amp tech giving it a good look over to see if it needs anymore love. I'll deal with the tubes and what I've bought when I get this back. Might be a couple of weeks before it gets on the bench and gets returned to me. Looking forward to sharing my thoughts. Big thank you to those that have shared over the years. Your recommendations were noted and made it easy for someone like me to come in and learn from what's worked for others in years past.