It's normal. The stainless steel chassis is the reason. If you leave the amp on all of the time, it will stop after a day or two. Nothing to worry about. Don
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The thing you want to watch with a TNT200 is the DC pulse on power up. This WILL demag dynamic speakers over time.
Best to leave it powered on all the time.
This is not a guess, I had 2 TNT200's for several years.
Best sounding used SS amp under $500, IMHO. Blows the newer Hafler's (i.e. 9500) away.
Replace the coupling caps with some MIT PPFX for a real suprise!