I have, on a couple of occasions, carried my Yamaha THR10II wireless amp as hand luggage on International air flights.
No problem at all. You may need to check your hand luggage allowance but, otherwise, you should be fine.
Note that, in my case, I had no choice but to carry my amp as hand luggage because of the batteries in it which could not be in checked luggage. In your case you have a choice if you can fit it in your main luggage (and trust the baggage handlers).
In my case, I had it in a fabric bag (the official Yamaha carrying bag). You might want to consider a bag or wrapping it in some way so you don’t have loose cables flapping around as it goes through security scanning.
This has been posted before, but it is useful to remember when you hand over your stuff to the desk… so keep it with you if possible, check in first then they are often easier according to Bax-shop