[R-390] line filter for EAC R390A

[Roy Morgan]

On Jul 28, 2009, at 11:50 AM, Graham Baxter wrote:

> I isolated my line filter from the chassis using power transistor  
> insulated
> mounting bushes....it cures the GFI (RCD in English) problems, and  
> does
> not much change the original appearance.

Graham,

HOWEVER, it does introduce the possibility of a dangerous situation.  
Should one of the bypass caps in the original filter fail shorted,  
full line voltage would be on the filter case. A future hapless owner  
might not know this and get electrocuted.

This situation is very similar to the "cure" offered in Hollow State  
News years ago for a leaking B+ filter choke in the  SP-600.  They  
suggested to insulate the choke case (metal) from the chassis.  This  
is very dangerous, especially there where the leakage fault is known,  
is present, and the voltage is more or less full B+.

Roy


Roy Morgan
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Groton NY, 13073
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