Tube Amp Ocean Noise?

My Kustom Coupe all tube amp has been emmiting really loud ocean wave sounds that present on both channels but is far worse on the lead channel. The amp is very high in gain. I took it to a tech and he said that since it is a high gain amp, it will cause ocean noises and that they are normal. This puzzled me because i have known ocean sounds in a tube amp to be very problematic. What could be causing the problem. Tubes, Pots, Resistors?...