[Amps] Cell phones, digital cameras and RF

["Fuqua, Bill L" <wlfuqu00@uky.edu>]

  How many times have you taken a picture of an amplifier tube glowing very red 
with the cover removed and with a cell phone or digital camera?
I have done it a number of times and yet the relatively intense RF electric 
fields seem to have no effect. I have taken photos of my 4-1000A amp with
bright red plate and probably 6 or 7kV p-p rf only a foot away or so.
They must be very well shielded!
  73
Bill wa4lav
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