Mechanical Hum from Class A Amplifier Clayton


Hi All,

Need some advise,

I have a paid of Clayton M300 Monos,

Speakers Tested on were Danley SH50 Horn 100db and Legacy Audio Whisper XD 94db

I noticed one of the mono block has a louder Mechanical Hum and tends to get hotter. The amps are giving off a Hiss sound with some mechanical buzz noise in the midrange drivers.

The other mono block has hiss and slight hum with a much lower Mechnical buzz from the amplifier. What concerns me is the Hiss noise. Its not only a hiss but some buzz mixed into it.

I tried connecting the amps directly to the wall socket and to a AC Regenerator and nothing seems to sort the issue out. Is this normal noise for a Class A amplifier to make a loud hissing noise? My Tube amps have a lower noise floor specially the Bob Carver which are dead silent, The ATI amplifier is Also Dead Silent.
dragon_vibe

Showing 1 response by swampwalker

Do you run them both off the same circuit? If so, then any residual noise or mechanical hum/buzz should be the same (w/in normal piece to piece variance). If they are not on the same circuit, you may have some DC offset on the circuit w the noisier amp. Class A vs AB should have nothing to do w it, other than a hot/warm idling Class A amp may put more thermal stress on internal components and cause faster wear.