Can anyone tell me the burn-in time after re-tubing Cary SLP-05 Pre-amp? I just replaced the 6SN7 with Electro Harmonix Gold Plated 6SN7-EH after experiencing static sound from one of the channels. My Six Pac Amp is on the way. Hope I can find a nice change with Plinius SA-102 with my type of music (Jazz).