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Re: New tubes for an Anthem.

Contact SFI (there was a phone number posted here a few days ago, maybe a search would uncover it again!). I have had experience with my own gear with the same type of "whistle/squeal" problem, but it wasn't SFI stuff, so I can't really say what you've got there (mine tuned out to be a voltage regulator that was under spec'd for the amount of tubes it was supposed to supply to- the protection circuitry kept cutting in and causing oscillation!).
Nick at SFI should be able to help you track the tube or part problem down!
BTW, they do sound good, don't they?!
Cheers
Dman


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