Mechanical Hum from Class A Amplifier Clayton

Yes but the coda is only 100 watts into Class A

my Preamp is fully balanced, Even when no source is connected the amplifier is very noisy. I am speaking to Wilson now probably going to send them back. Mines were purchased this year and came to me with a fault, I shipped them back to Wilson for repair and it came back faulty and noisy again. I assume its the power transformers are not designed well for the 220-240 voltage.

I stressed the amplifier todays and they keep cutting off at some point, something don't seem right, My Bobs and ATI drive them at insane levels yet the claytons are cutting out when the volume bar is up at 48. The bobs pass 60 easily at points my ears cant handle them and the speakers are dynamic. Even testing on the Danley the Amps just drop out signals. Both are behaving this way I assume the power designed for the 220-240 voltage is not ready yet.

I have removed them and they going back to Wilson, The Midrange from the mono amp is distorting.

Getting a Refund, This unit was sent back to Wilson for repair as the first time it was noisy and the sound was distorted. Came back and still got problems. Not taking the risk again. Already spent thousands of dollars on shipping, Tax and Agent Fees. Going down another route. Possibly MSB 203 Mono Blocks.

No matter what I did, the noise and distortion is always present. The fact that the midrange and upper frequency was very distorted during higher spl levels drove me to think something is seriously not right. Both Monos had noise which I find it way above normal use. Yes my Speakers are all sensitive but this is no excuse. a Very well built amp should not make too much noise. This sort of noise was not your average hiss. It was a multiple frequency buzzing noise with background hiss. Something I have never heard. It is a shame as the amps have potential but a loss of just under 3000 dollars in all shipping and agents, Tax, Duty and clearance at 2 ports just really too it too far. I was hoping the second time round they were shipped back to me it will be fixed yet it felt like nothing was changed. Wilson is a nice person, its a shame that my units turned out to be like this. Guess it was not for me and I cant run the risk of taking another chance.

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.

How would you guys compare the Pass Labs to the Coda? in Class A?

and how about the MSB 203 Mono amps running as it claims at 200 watts per channel?