My Linn Klimax Kontrol pre-amplifier has developed an intermittent buzzing issue.
The unit was bought new by me in 2003. No upgrades. There is no on/off switch on the Kontrol. The unit is always in standby mode while plugged in.
The noise is not a humming sound but more like a buzzing sound. The issue occurs at random, but if the unit is powered off, then powered on and left powered on, the buzzing normally doesn't start for 24-48 hours. If the unit is powered off, then on, once again the buzzing doesn't start for 24-48 hours. The buzzing sound can occur even if the unit is only i