Audible Illusions Modulus 3A problems

I own an Audible Illusions Modulus 3A and it has the stepped attenuators. the right channel has started making very loud popping noises when changing settings. Once it is in a set static position it sounds fine. I used to be able to spray it with a cleaner and it would operate silently for a month or so but now it pops no matter what! I'm reluctant to send it back because I've heard horror stories about getting them back in ones own life time from the factory. Any suggestions ? Is this common? Any fixes? Is the factory the ONLY choice?
It can be something to do with the tubes. Try changing them to a known good quality set and see it would help. There were other tube preamplifiers I used to have that had similar problems. It turned out to be bad tubes.


It appears that the switches internal contacts are beginning to loosen/break-down. Suggest you contact me regarding replacing the sub-assembly. Cost is $250 and now takes apx. 7-10 days. Regards, Jerry/AI Service Tech
I think the first response is correct. The same thing is true with my M3A, vintage 1998. Dust and dirt get into the attenuators producing noise when changing them. It has no effect on the performance. AI offers two deals: upgrade depending on year costs up to 850. Trading yours for a new one with AI costs 1390. IMHO, a little noise when changing the attenuator isn't worth either price presuming that the preamp is functioning correctly.
I have a Modulus 3 that has been modified by the factory to a Modulus 3A with a similar problem. When changing the left volume you here a scratchy noise but once you leave it it plays okay. Please let me know how you solve this problem.
The Preamp sounds FANTASTIC and I may just mute the signal when I change the volume for a while. The $850.00 and up is more than I want to consider but eventually I may go for the $250.00 fix. I appreciate the response from the factory, this is a great preamp! I am considering going to the stock phono section rather than the Gold board so if I do I'll need to fix it first.