[R-390] Second R-725 on ebay

[ToddRoberts2001 at aol.com]

Hi All,
It looks like a true R-725 has a mu-metal shield added around the outside  
of the round PTO shield
can. Does anyone know if it really makes a difference in the performance of 
 the PTO?
 
I know mu-metal shielding is added around small audio transformers to  
reduce the 
chance of any hum pickup. Is the R-390A PTO susceptible to hum pickup  from 
the
power transformer next to it on the underside of the chassis?
 
I see it looks like there is some kind of added transformer next to the  
regular power
transformer on the underside also on the R-725?
 
If adding a mu-metal shield is beneficial there are places that sell  
mu-metal foil that
one could wrap around the PTO can.
 
73 Todd WD4NGG
 
 
 
 
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