While at CES we found that one of our Tube Repros seemed to be going a bit dull on top after being left on for 48 hours. We had experienced this only once before, and PB reminded me that in that case the sonics were brought back to normal by a simple switching of power off and back on. The common thread between the two incidents was very low humidity. We seemed to have a static charge building up on some panels on the chassis when the Repro was left on for a long period of time and somehow that is affecting the sonics a bit - but only in very low humidity environments (humidity at CES was around 30% and humidity is 98% here today so I don't think I can reproduce the problem!). Switching the Repro power seems to bring everything back into proper equilibrium. So if you live somewhere that is very dry and you leave your Repro on all the time, you might want to "reboot". Make sure you don't have tape on the playback head whenever you switch the power on or off. That goes for all tape recorders...