I have just finished upgrading a pair of these with matching preamp, and had been listening to them for a couple of hours, configured as mono blocks- they sounded great.
I noticed a little white smoke, and although it was playing fine (with green leds), turned them immediately off.
I opened the one that seemed to produce the smoke, and all looks fine, except for a small pool of what looks like sticky liquid under the transformer (photo's attached).
Does this mean the transformer is getting too hot and will fail at some point?
I have not seen this before
all caps have been replaced as have some transistors, all measures as it should
any thoughts?
I noticed a little white smoke, and although it was playing fine (with green leds), turned them immediately off.
I opened the one that seemed to produce the smoke, and all looks fine, except for a small pool of what looks like sticky liquid under the transformer (photo's attached).
Does this mean the transformer is getting too hot and will fail at some point?
I have not seen this before
all caps have been replaced as have some transistors, all measures as it should
any thoughts?
Attachments
"Does this mean the transformer is getting too hot and will fail at some point?
I have not seen this before"
Was the transformer hot to the touch ... that will tell you if it is under stress from a heavy load or shorted turns.
I have not seen this before"
Was the transformer hot to the touch ... that will tell you if it is under stress from a heavy load or shorted turns.
I have an apt, and there are definitely smallish electrolytics on the amp boards which is what is in the picture. Unfortunately, it is pretty tight. Maybe you could see in with one of those usb probe cameras. I know when I took mine apart I was amazed how crammed everything was. The P/S caps are at the back of the amp, so I don't think one of those. The P/S board is on top of the caps as you probably know, so not there either. Good luck.
large sigh of relief- yes it is a cap, a new Nichicon UHE 47uf has given up the ghost I will figure out the rest, thanks for all your assistance
I had put a 100uf 35v UKL in place of a 47uf 100v UHE on an 80v rail- they look identical,- I blame my eyesight.......
Hmm, you should double check. There is a 35V/47u on the amp board that connects to -65/-80. It is for smoothing the current source of the diff amp. Is that the one you are looking at?
no- that has been replaced. I have replaced the 0.33uf filter caps on the +ve/-ve 80v rail with 47uf 100v UHE. This a couple of other tweaks has improved the dynamics and reduced the noise floor.
a good practice to have and to use after such mods is the dim bulb tester, saves you a lot of grief...