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Old 20th Jun 2021, 5:47 pm   #72
ms660
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Join Date: Apr 2011
Location: Cornwall, UK.
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Default Re: Vintage Sears Silvertone radio safety question

Quote:
Originally Posted by sweepthedog View Post
Can anyone explain what a floating B- line chassis is layman terms?
In the context of AC/DC receivers of the type being discussed it means the HT-ve line in the receiver is not connected directly to chassis but connected to chassis via a capacitor, in the schematic for your receiver that capacitor is shown as having a value of 0.2uF, capacitors exhibit reactance, the reactance of a 0.2uF capacitor at 50Hz is approx. 15.91k (15,910 Ohms) that means that under certain conditions when using a 240 volt to 110 volt step down auto transformer a current of approx. 15mA is available to flow from chassis to Earth via whatever path, human or otherwise.

Lawrence.
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