Hi There,
This is my debut post here, but I've been reading everyones' advice on this forum for about 18 months now- I have built a couple of chipamps and am generally up for getting stuck in where I can... but I'm far from understanding everything, which will come in time i hope!
I've had a Pioneer SA-6200 integrated amp for about 10 years which dates to the early 70's I believe, and I love it- nothing has ever gone wrong, and it sounds great... until last week!
Actually this problem had shown it's ugly head a few months back but it only happened once, then went away... When I power the unit on now, almost instantly a very loud crackle is pumped out, regardless of volume setting.
Not wanting to pester the gurus on this bored I got the old screwdrivers out, popped the hood (built like a tank this thing) and ordered replacement Smoothing caps (there is no hum with the crackle, so i figured it wasn't the power supply, but as i say i may well be wrong!). They arrived this morning and I got the iron and swapped the caps...
Turning the unit on again crackling started- but only for a second or two- then stopped... ok!?
After connecting a source the amp was working fine, for 10 minutes (and the volume was fairly high, figuring heat might be a factor, but as i said the original problem was from power up)- then it did it again, drivers on test speakers pumping away. I powered it off then on again and have been soak testing it for well over an hour with no problem.
I know it's tough not seeing the thing but has anyone any idea what the trouble could be? I've definatly improved the issue but it is obviously still there in some form or other. I would have thought it was either the Caps or not!? I'm really hoping it's not the transistors or anything...
Any help would be greatly appreciated...
This is my debut post here, but I've been reading everyones' advice on this forum for about 18 months now- I have built a couple of chipamps and am generally up for getting stuck in where I can... but I'm far from understanding everything, which will come in time i hope!
I've had a Pioneer SA-6200 integrated amp for about 10 years which dates to the early 70's I believe, and I love it- nothing has ever gone wrong, and it sounds great... until last week!
Actually this problem had shown it's ugly head a few months back but it only happened once, then went away... When I power the unit on now, almost instantly a very loud crackle is pumped out, regardless of volume setting.
Not wanting to pester the gurus on this bored I got the old screwdrivers out, popped the hood (built like a tank this thing) and ordered replacement Smoothing caps (there is no hum with the crackle, so i figured it wasn't the power supply, but as i say i may well be wrong!). They arrived this morning and I got the iron and swapped the caps...
Turning the unit on again crackling started- but only for a second or two- then stopped... ok!?
I know it's tough not seeing the thing but has anyone any idea what the trouble could be? I've definatly improved the issue but it is obviously still there in some form or other. I would have thought it was either the Caps or not!? I'm really hoping it's not the transistors or anything...
Any help would be greatly appreciated...