Strange ticking noise when amps were powered on from cold

Forgot to mention that after 5 mins from cold start up the ticking noise just suddenly stopped on both speakers simutaleously...Also it's a very faint ticking noise that I couldn't even capture it with my iphone sticking next to the drivers. 

If I leave the units on till the noise stops, then switch off the main, then swtich the units back on, I could not hear any noise. It only happens when the units are swtich on from completely cold (discharged??).

@oldhvymec 

No other issues other then the ticking noise. They sound great as usual. 

I just noticed it as I was planning to sell them so I removed my current amps and powered on the Aesthetix monos to make sure everything's fine. It could have been happening for a while as the ticking noise is so faint so I didn't notice it before? or because the monos were in standby when not used. I only switched off the mains if I do not plan to use them for an extended time (e.g. traveling overseas)

The monos are hybrid amps with one 6sn7 in each channel.

8 year old

LOL...no silly things done or noticed.

I'm really baffled here...

@ditusa 

Thanks mate but what I heard is continuous ticking (10-15 beat per second) instead of some random pops.

@tomstruck 

Thanks mate. One of the potential buyers acutally contacted Aesthetix regarding this and was advised that they never heard of such probem before. 

I should add that I might not have the best AC in our house. Previously whenever my wife switched on the dimmable down lights I could hear a pop from the speakers. A Torus isolation transformer fixed it. However, now even with the down lights switch off I could still hear the ticking noise in the first 5 mins.

@oldhvymec 

You may be right that the monos are just fine but I just feel a bit hesitant selling them if there is slightest chance that they are faulty. Just trying to be a responsible and ethical seller. But how could the noise appear and disappear on both units simutaneously? What's the chance of them becaming faulty at the same time? This is really beyond me...

@tomstruck 

Are yours the stereo version or the monos? You sure you couldn’t hear the same ticking noise? As I said it’s VERY faint and one really has to stick the ears to the drivers to hear it. I didn’t notice it before either. Could you please switch off the mains on tour Atlas, wait for at least one hour,  power then back on from cold then listen to the speakers closely?

@oldhvymec 

I don’t have a volt meter. The voltage on my UPS screen shows the correct local voltage of 230v

Not very practical for me to move them to a different system. No audiophile friend living close by…

Tried with the preamp and DAC disconnected. Same symptom.

@gs5556 

Tried replacing the 6sn7 tubes…same.

I should mention that the noise doesn’t get any louder when the volume is turned up. 

Thanks everyone for your input. Will check with Aesthetix.

@tomstruck 

Thanks. Selling them as I would like to explore OTL or SET : ). 
 

Update: an informed buyer took the plunge and bought the Atlas monos last night. Tried at his place this morning with no ticking/hum what so ever…dead quiet….actually quieter than his solid state….so there does seem be some problem with my AC…Happy ending for both of us nevertheless.

Time to get dedicated AC.

Thanks everyone one for your input. Much appreciated.