1060 capacitor question

[Scotteboy]

Hi , I have restored a 1060 and it tested out fine and during an extended play, distortion and a Pop! smoke lets out. I looked and all I found was two burned out what appear to be 100pf mylar capacitors in positions c724 and c723 on this amplifier board. The standard 1060 schematic does not have these listed. A model 1060b schematic shows them and lists them as 220pf ceramic capacitors. My question of course is what should go here ? The amp I am working on is a 1060 and not a B designation. The outputs are all upgraded to MJ21194 as well. I set the idle to 7.5mv across resistors r747 and 748. Any help is appreciated !

 

[Scotteboy]

So it looks like the schematic matches with the board I have , the parts list just does not. If this is followed then 100pf is the right value and it looks like most later boards had ceramics so overall I think this is what I will use but the question now is what made 'em burn up ? Guessing age as much as anything !

 

[ivandezande]

So it looks like the schematic matches with the board I have , the parts list just does not. If this is followed then 100pf is the right value and it looks like most later boards had ceramics so overall I think this is what I will use but the question now is what made 'em burn up ? Guessing age as much as anything !

Age did not make them burn up. You did something wrong in your "restoration". Double-check your work in that area.