I've got an infinity ps-12. The amp and sub are built into the enclosure. Around 15 years old and rarely on.
After about 20 minutes of use, the amp starts making a unique crackling sound. No bass is present at that time.
If I take the amp out of the enclosure, and blow on the heat sync.. Or surrounding.. The crackling stops.
If I leave the amp sound board out of the enclosure, it's fine.
I can see one of the tubes or capacitor looks a little swollen and on the other side of the board there's a black scorch mark almost exactly where that tube is. I'll post pics and sound clip if I can
After about 20 minutes of use, the amp starts making a unique crackling sound. No bass is present at that time.
If I take the amp out of the enclosure, and blow on the heat sync.. Or surrounding.. The crackling stops.
If I leave the amp sound board out of the enclosure, it's fine.
I can see one of the tubes or capacitor looks a little swollen and on the other side of the board there's a black scorch mark almost exactly where that tube is. I'll post pics and sound clip if I can
Attachments
Last edited:
The right capacitor on the second photo looks vented. I would replace the two.
Check the grey 5W resistors and inductors solder pads also.
Check if there is leaked electrolyte (corrosive) on the board and clean.
I would say the board is the same as my JBL Northridge sub.
On mine I've drilled some holes behind the transformer in order to release heat.
Check the grey 5W resistors and inductors solder pads also.
Check if there is leaked electrolyte (corrosive) on the board and clean.
I would say the board is the same as my JBL Northridge sub.
On mine I've drilled some holes behind the transformer in order to release heat.
Last edited: