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Air tight ATM 211 and MAXX

I have currently encountered a shocking and dreadful experience with Air tight ATM 211 mono amps. I did not unplug the amps for 5 or 6 days from AC outlet and after 6 days when I turned on the power amps in a few seconds a very loud and shocking noise appeared in the speakers which I had to rush and turn off the amps before they damage the speakers. The noise was so loud and striking that I thought I had burnt the speakers! What could be the reason and how can I avoid such problem.
Thanks for your advise.
fpooyandeh
justlisten's avatar
justlisten
489 posts
 
I have run Air Tight ATM3 monos for over 3 years. Always had them plugged in. they have been bullet-proof.

Do you have a tube tester? try checking the driver tubes.

I know Tom Tutay has installed Soft start circuits in many of the Air Tight amps, this could help avoid the sudden rush of current to the amps.
dweller's avatar
dweller
3,781 posts
 
The only similar problem I've had was turning off my Almarro A203A (EL84 based integrated, 3 watts/ch) and turning it immediately back on. This blew a fuse for some reason.

I was told to let the amp rest a few minutes befor turning back on.
samuellaudio
91 posts
 
did you get your problem fixed?
fpooyandeh OP
13 posts
 
Unfortunately the problem with DC current still exist in my amp which creat a very sharp loud noise in speakers. I was told to have my AC earthing checked but I do jot have any problem with my KRELL amps. I think it is a flaw with the air tight amps and pres with the design.
Any suggestionelec
aleko's avatar
aleko
33 posts
 
This is now very old forum but the outcome is not clear.
IMO the problem is not a as you say a 'DC problem' as the noise does not persist all time the amplifier is on.
I know that these amplifiers have a soft start curcuit.
There are 2 relays (2) which switch the high voltage after 60 seconds or so.
May it be a relay having its contacts stucked?
Why not have the relays checked by a technician - how they behave at switching the amplifier on?
Wish you luck
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