Set your volume to maximum low and turn off your amp first and wait for a minute or two and then turn off your pre-amp.Result will be dead quiet.
tubed preamp off and ss amp left on?
Why can't I leave my my ss amp turned on with the tubed preamp turned off? Loud hum occurs through speakers with this condition. When I had a ss preamp I could leave the amp powered all the time with the pre off. I would leave all powered up but concerned about the preamp tubes wearing prematurely. Is it a reasonable conclusion that I could leave everything powered on all the time and just change the tubes once per year?