Audible Illusions Modulus 3A problems

Johnatmc99,
I have a 1995 AI L-1 and it is as quiet as a church mouse. Maybe just defective units or a very uncommon amount of dust in the environment. AS far as the original post i would just give Jerry a call.

Jo, are you sure your amp is working properly? I found some of these 'pops' using the M3A on amps with some problems on the output stage. It could also be a stepped attenuator problem, but this is my experience. The problem was not the preamp but the amp.
Bye

I am sure it is the stepped attenuator. I have switched tons of amps into the system just to have fun
and the preamp, right channel, is consistently the culprit. It is a very loud and destructive sounding pop! The cleaning worked temporarily as mentioned by others.

I do love this preamp and after five years I retain the
original tubes. I've bought others brands to play with but the microphonics were horrible and am going to have to bite
the bullet and spend $100+ at AI or Kevin Deals to retube this.

I am hesitant to do all of this because I pre-paid for the preamp factory direct via my employeement and it took AI a year to deliver and at times I wasn't sure if it would ever show up.

I had exactly the same problem..changed out the tubes and the noise drastically was reduced...only problem is this Pre eats up tubes fairly quickly!

I just ran across this post and am curious if anyone else has come up with other solutions to the problem of stepped attenuators causing popping noises when turned.