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Old 14th January 2005, 11:43 AM   #11
SY is offline SY  United States
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With filament (or even HV) transformers, frequency response is quite variable from one construction to the next- it's not a variable that the units are designed for. In fact, the best units have pretty terrible response- you don't want to couple all the HF garbage from the line into your amp. That's one reason that some designers eschew the use of toroids for power transformers.

In any case, there's no general answer- you have to check it on a case by case basis.
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