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How do you properly ground a Tamura OPT?

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i have been using the Tamura F-475 for some months now but the secondary (to the speaker) is floating.

the F-475 has pins for "E" and "G" and i suppose they're for earth and ground, respectively?

so do you connect the "E" to the chassis and "G" to the signal ground (via the input RCA ground)?

my MagneQuest DS-025's common is connected to the input RCA ground, which i suppose is the right thing to do. please correct this if i'm wrong.

cheers.
 
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