Thread: Admiral Roundie Something explodes
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  #62  
Old 02-04-2011, 01:36 PM
DaveWM DaveWM is offline
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Join Date: Feb 2009
Location: Orlando FL
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pretty sure it uses a switching power supply for the filament, that is what you are hearing, mine does it to, its pretty hi pitch, I would guess in the 10-12khz range.
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