Source fo "Feed Through" Capacitors for U67 - Help

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From my brief research on the subject, there are three types of feedthrough capacitor which are physically indistinguishable: capacitor only, inductive element in series with the through line, and one with a Pi filter. I imagine extra inductance in series with the audio outputs is asking for trouble. How do you tell them apart? Which type is used in the original?
 
From my brief research on the subject, there are three types of feedthrough capacitor which are physically indistinguishable: capacitor only, inductive element in series with the through line, and one with a Pi filter. I imagine extra inductance in series with the audio outputs is asking for trouble. How do you tell them apart? Which type is used in the original?
"Capacitor only"
 
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