NEW JC-2 Breakin time???

If you do a search I think you will find that it takes a lot of hours before the unit finds it final sound. 600-1000 hours sounds familiar. The designers have stated as much in an article or comment I read some time ago, so be patient. A lot of users seem to love it, so they must know what they are talking about.
Be patient.

Don't expect that the amplifier will sound very good suddenly with 600 hours of break in! Otherwise it would be magic. Do you believe in magic?

Chris