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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
dragon_vibe OP
430 posts
 
My theatre speakers are 100db, The ATI Amplifiers run them.

My 2 channel are 94 db.

I like to keep head room on the amp rather then driving them to certain aspect of there limits.
dragon_vibe OP
430 posts
 
How would you guys compare the Pass Labs to the Coda? in Class A?
dragon_vibe OP
430 posts
 
and how about the MSB 203 Mono amps running as it claims at 200 watts per channel?
jmcgrogan2's avatar
jmcgrogan2
6,346 posts
 
Pass Labs compares very favorably to the Coda house sound, in fact I wish I could afford the Pass Lab amps. Those 200 wpc pure Class A XA-200.5 monoblocks will set you back over $34K!!! They should sound awesome at that price!!

I haven't heard the MSB amps.
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