Schematic Precision Power A600

[mischka]

I have two A600 in my possession.
and both repaired since I have bought defective.
one works for five days, the others still have not tested

it was in there with two 2N6487 / 90
but these were broken again and again
now I have the BD911 / 12 tested

then I have an A1200
by cross exchange, I have found that the pre-amp must be broken
I found this offer:
PPI Precision Power Class A ceramic card for Art PC PCX - eBay (item 220531778320 end time May-25-10 14:21:58 PDT)

I found this story interesting suggestions in the further forward me in my trouble shooting

best regards from Leipzig, Germany

 

[mischka]

After 2 minutes it failed.😡
I replace it with another BD912 (always by ST) but after a minutes, with low music (1/4 of power) it failed.
Same BD912.
I replace...then it re-failed..same BD912..
For 5 times up to now (i finished BD912😛).
In that 5 times i changed mica with siliconic sheet..but nothing.

so like it was with me also
and only one Kannal
and one transistor