richie00boy

[P901]

Good evening richie00boy,

Thanks again for the suggestions.
Quite coincedental you should mention disconnecting the incoming signal lines.
About a week ago, (after a months worth of recap work) I connected a new CD player to the Sansui and had the most annoying hum. Of course I suspected my work.
The amp went back to the workbench and I went over it again with a magnifying glass.
Very disappointed to not find some easily discovered silly mistake, heavy hum still present.........
Switched sources to my non DTS CD player to hear a favorite piece to try to console myself, hum was gone !!!
Bad DTS CD player, what a relief.

The very slight hum I have now may be caused by the fact that, after I did a polypropylene final cap upgrade, I was not able to refit the metal shield cage over the internal pre-amp section.
Wishful thinking that this cage was not needed, (if the Sansui engineers had been able to do away with it I realize now they probably would have done so).
So my first move is to do a slight relocation of the large bulky poly caps on the adjacent circuit board and refit the shield cage over the driver pre-amp section. (Which is, of course, only six inches away from the 220w power supply transformer).
Again, wishful thinking, that someone on the board would have a clever tweak whereby I might have inserted a certain cap in a certain location and saved myself some work, not to be it seems.
As they say, do a proper job..........
Thanks again for all your help, andrew

[richie00boy]

Glad to be of assistance and pleased that it all turned out good in the end