Avguygeorge,
Turn on sequence:
Turn on preamp, turn down volume, turn on power amp.
Turn off sequence:
Turn down volume, turn off power amp, turn off preamp.
If you still get noise, there is something wrong with your power amp. You should have it checked out.
Turn on sequence:
Turn on preamp, turn down volume, turn on power amp.
Turn off sequence:
Turn down volume, turn off power amp, turn off preamp.
If you still get noise, there is something wrong with your power amp. You should have it checked out.