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Amplifier hum - normal?

Is it normal for amps to emit a slight humming noise from the transformer when turned on?

I never noticed it in my old integrated that I lived with for over 10 years, but that was lower power. Now I've gone from 50wpc to 120wpc... don't know if that makes a difference here though.

I mean, it's not nearly enough to bother me or even really be audible past 3 feet away... but I am curious if this is typical for amplifiers to do this.
djembeplay

Showing 3 responses by kijanki

kijanki's avatar
kijanki
4,397 posts
 
See this circuit:
img.villagephotos.com/p/2003-5...

The only 1000V diode is 1N4007. 1N4001 is only 50V
kijanki's avatar
kijanki
4,397 posts
 
"A lot of modern amps have toroids, which are more prone to humming and buzzing as a result of DC on the power line."

As far as I know Toroid is very quiet compare to non-toroidal transformer. In addition is more efficient because of low stray magnetic field (one tenth of traditional transformer) and higher power rating for the size because of higher flux densities (up to 18000 Gaus vs 14000 Gaus in non-toroidal transformer).

The only disadvantage of toroidal transformers that I know of is cost of winding.
kijanki's avatar
kijanki
4,397 posts
 
Gbart

Thank you - that was very informative.
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