Reverse the speaker cable going to the speakers. If the problem goes to the right speaker then you will know that left channel of the amp is the problem!
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Assuming the problem is isolated to the amp which will most likely be the case, try turning on the preamp a few seconds before the amp and see if you still hear the pop. You probably will not. As for the whoosh sound, its most likely the power supply capacitors that are near their end of life. My very old Adcom 545 did it too.
The Forte Audio 1A is a great amp, however it does have some age and should be serviced. The absolute best person for the job is Jon Soderberg at http://www.vintageamprepair.net After his service, it will likely perform and sound better than it did when new. He was a service manager at Threshold when the amp was introduced for sale.
I reversed the cables. Turns out it is the left channel. Thanks Yogiboy!
Checked out the amp repair site. I'll get in touch with them on the buzzing and pop sounds. What a great resource!
@firstnot - What amp are you using with your Audible Illusions 3?
Is it better to use a tube amp with a tube preamp?