Sounds like you may need professional help.
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Think you need troubleshooting flow chart. It will help to narrow down to piece of equipment where problem lies. Had a similar problem recently. Muting pre-amp seemed to elimiate problem, but with use of http://www.avahifi.com/trblsht.htm I found out problem was bad power transitor in power amp. Wasn't expensive to repair. $90 including S&H. Good luck.
Thanks for yoru responses. After the problem occured, I turned everything off overnight. Last night I fired it back up and had could not replicate the problem, even after 2 hours of steady listening. This probably lends credence to an intermittent tube issue in my amps (Manley Neo Classic's). I appreciate the input and will troubleshoot accordingly should the problem rear it's ugly head.