>I recently boxed-in my all-purpose power supply with thin panels of wood, >in order to protect the cats... >Just prior to the box-in, I ran my 8877 6M amp at 4200 volts idle, and 3800 >volts at 1 amp load with no problems. >Under a 1 amp load I'm also hearing a (60 cycle?) loud hum. Are you missing any cats? Colin K7FM