Hi!
I`m currently having a problem with one of my amplifiers, a Hegel H1. When I power it up, it makes some pretty harsh, loud popping and crackling noises in my both my speakers. This goes on for some 2-3minutes, until it seems it`s gotten up to temperature.
So I popped it open today, while powered, hoping to find a blown cap, or a cold solder. However, before I started looking over the components, I decided to vacuum out some dust and hair that was in the amp. Luckily I did, cause when I vacuum around the power regulators LM317/LM337 the speakers start producing the same noise as on startup. I`m thinking the air being sucked in to the vacuum has a slight cooling effect on the regulators, and they start producing the noise as they get slightly colder? I don`t have any cooling spray atm., so I can`t try that, to verify that it is in fact a temperature-drop that is causing them to produce this noise. But I can provoke this noise every-time with the vacuum.
So, has anybody ever experienced this kind of behavior from LM317/337 before? Can they produce ripple/noise if they are faulty? I do also think they are running quite hot, the LM317 is running at about 71degrees C, and the 337 is at about 62degrees C, is this abnormally hot?
Regards
- Bjørn W
I`m currently having a problem with one of my amplifiers, a Hegel H1. When I power it up, it makes some pretty harsh, loud popping and crackling noises in my both my speakers. This goes on for some 2-3minutes, until it seems it`s gotten up to temperature.
So I popped it open today, while powered, hoping to find a blown cap, or a cold solder. However, before I started looking over the components, I decided to vacuum out some dust and hair that was in the amp. Luckily I did, cause when I vacuum around the power regulators LM317/LM337 the speakers start producing the same noise as on startup. I`m thinking the air being sucked in to the vacuum has a slight cooling effect on the regulators, and they start producing the noise as they get slightly colder? I don`t have any cooling spray atm., so I can`t try that, to verify that it is in fact a temperature-drop that is causing them to produce this noise. But I can provoke this noise every-time with the vacuum.
So, has anybody ever experienced this kind of behavior from LM317/337 before? Can they produce ripple/noise if they are faulty? I do also think they are running quite hot, the LM317 is running at about 71degrees C, and the 337 is at about 62degrees C, is this abnormally hot?
Regards
- Bjørn W