allanmatters
Active Member
Hello fellow AK'ers
Was hoping if I could get some help on this . I did read many forums here on the subject noisy transformer as well as other forums . Read about vanishing resin potting etc all the differences.
The transformer in my pioneer a-7 makes loud buzz after 30mins to 40 mins with use or even with it just left ON with zero volume . The system has been repaired by a technican previously due to other problems. However the noise was there before that repair as well . I am sure it is from the power transformer only . I had removed the metal case around the PT and poured hot wood varnish partially on some of the laminated plates back in 2013 while the PT was also quite hot during this experiment . The sound went away completely and returned less than a year again
There are 4 holes in the transformer laminations in the horizontal position and the laminations are in vertical position
I plan on pouring insulated varnish and putting 4 long screws across with washers to tighten it
Have some questions though which I have doubt on
1- what's the difference between fully cased transformer like the sansui 9090DB and the one in the pioneer a-7? As an example I am asking ..
Because in my transformer it's is partly cased in one direction around with 4 holes but no screws , while in the sansui, it's Fully cased Box with screws and nuts
I plan to apply the insulator while the PT is hot And then put 4 long screws to tighten it ,
Note - I have no case on my laminations of the transformer ATM as I had removed it back in 2013 when I poured the varnish .
Was hoping if I could get some help on this . I did read many forums here on the subject noisy transformer as well as other forums . Read about vanishing resin potting etc all the differences.
The transformer in my pioneer a-7 makes loud buzz after 30mins to 40 mins with use or even with it just left ON with zero volume . The system has been repaired by a technican previously due to other problems. However the noise was there before that repair as well . I am sure it is from the power transformer only . I had removed the metal case around the PT and poured hot wood varnish partially on some of the laminated plates back in 2013 while the PT was also quite hot during this experiment . The sound went away completely and returned less than a year again
There are 4 holes in the transformer laminations in the horizontal position and the laminations are in vertical position
I plan on pouring insulated varnish and putting 4 long screws across with washers to tighten it
Have some questions though which I have doubt on
1- what's the difference between fully cased transformer like the sansui 9090DB and the one in the pioneer a-7? As an example I am asking ..
Because in my transformer it's is partly cased in one direction around with 4 holes but no screws , while in the sansui, it's Fully cased Box with screws and nuts
I plan to apply the insulator while the PT is hot And then put 4 long screws to tighten it ,
Note - I have no case on my laminations of the transformer ATM as I had removed it back in 2013 when I poured the varnish .
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