I am not certain it is your tubes. I would think it is more likely your cables picking up the interference from the cell phone and transmitting through the speakers. Just my two cents...
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My workmates and I are in a temp office, 5 of us all crowded around a table with wireless keyboards, mice, and blackberries plus a radio. You should hear all the buzzin and cussin caused by that mish mash of electronic genius. I get it in my car, and at home on my PC and my electronic keyboard but not on the rig.
You're right, I don't think it is the tubes, either. I have a simple system in another room with an NAD C320BEE integrated amp and I have never heard the buzzing through those speakers. That's why I originally thought it was related to tubes. But maybe it could be that I have a very badly shielded cable in my good system? Does that sound more likely to be the reason?
I forgot to mention that my Treo 650 (GSM cell) also interferes with my AT&T hard wired land line phone which is a business quality phone ($500.00) and has no radio or cordless features.
I think these phones are just nasty and as long as the GSM band is approved and operating as currently configured, we will be dealing with noise in many types of equipment.
Wonder if the I Pod people are having negative experiences with this too?
Frankly, I would be careful recording music, movies or whatever with a GSM device around. Good chance the noise will be perfectly "preserved" for you every time you revisit that software :^).