Mundorf silver in oil cap burn in?

Ecka- I don't know why I was thinking you had installed them in a pre-amp(mis-read apparently). The whole system would have to be in operation in the case of an amp mod(as you probably already know). Burn-in could be done with the speakers facing one another, and one wired out of phase to cancel part of the output(if you don't mind the time on your tubes).

As the others have stated, at least 300 hours of burn in is required before they start to sound right and let me tell you, do they sound right!

They are far better caps in speakers than in electronics from my experience, not to say they don't perform better than many others in electronics, but with speakers they are like peanut butter and jelly.. Electronics they are a little brighter sounding in all the applications I have tried in the past, they will settle down. Plus normally depending on the value you need they are just impossible to put in many electronics due to size.