Rca ground shocks

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something is definitely off at her place- because her electric oven is at higher temperature than whats written on the dial, and her tv goes off whenever i turn the amp on/off, and of course, now my preamp. but i want the preamp built well enough so that it can work here much like all her other electronics including the other ones i've brought over prior, 2 ss amps, that worked fine.

im thinking the preamp is displaying more issues because it's
-shoddy construction
-higher voltage.

i wanna remedy the shoddy construction part.
 
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