Power blackouts - problem for tube amp & speakers

We have a lot of power blackouts in our area. The power goes and it takes 30 seconds for the generator to take over. Could it damage a tube amp + speakers (plop?) when power goes and comes again ? I am considering an tube amp ( coincident dynamo 34SE ) to replace a battery powered RWA amp. I have to relocate every 4 years in third world countries and would like to avoid any additional weight (a UPS). Greatly appreciated if you could recommend any other lightweight tube amp under 25lb and more than 10W Class A amps.