Do u mean the input selector on remote?
By switching to passive it does turn off tubes, and will also power down tubes after not being used for awhile. If only arc could power down tubes when ht was in use, they have power control on remote.
By switching to passive it does turn off tubes, and will also power down tubes after not being used for awhile. If only arc could power down tubes when ht was in use, they have power control on remote.