Hello, I live in Korea. I'm looking to buy a German or permanent Marshall Amplifier here. But the voltage of the German and British Marshall Amplifier is 230V 50hz. The voltage in Korea is 220V 60hz
Is it okay to use the Marshall amplifier that I bought directly from Germany and the UK as it is in Korea?

Will there be a problem with the voltage frequency? The amplifier I am trying to buy is a Mashall SV20C model. I will attach the SV20C manual below

Please answer. Thank you