When someone at my home starts using blender I hear it in my guitar amp. Noise is single pulse and occurs when device starts and stops not between. How to prevent this other way than switching off all electric devices when playing?
This is most likely an RF spike picked up by your pickups. It is pretty common in buildings with old laundry equipment or heavy switch gear.
There is very little you can do about it, unfortunately, but try the following:
- ensure the device is powered off when you are practicing (simple but possibly annoying)
- shield the device (could work, but often it is transmitted beyond shielding by any cabling)
- shield your practice room, or at least the wall between you and the device
Or the best option: buy them a new blender. But before you do, borrow someone else's and test it in your use to confirm it is the blender and not something else triggered by the blender drawing current.