I have an old kenwood receiver that I've always used for a PC sound system. I believe it's an 80s model, purchased late 90s, been going ever since. But the hum is driving me nuts. Do amps increase in hum over time? Is it worth working on it? How do I decrease the hum? Is it 60 cycle? Couple of caps maybe? Or should I just go for andecent integrated amp. I have a Rotel from the 90s that hardly hums at all.
If the hum is in both channels, it's probably a capacitor, especially one of the larger ones.
Look for bulging tops or leakage, but sometimes they don't look bad. Normally it's 120Hz hum.
But a different, used receiver that works ok will be a lot easier on your nerves, if you have no
experience fixing these things. You'll need test equipment and experience. And patience.
Look for bulging tops or leakage, but sometimes they don't look bad. Normally it's 120Hz hum.
But a different, used receiver that works ok will be a lot easier on your nerves, if you have no
experience fixing these things. You'll need test equipment and experience. And patience.
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Could be a cap but it usually isn't. PS caps have to go really bad before hum shows up. I'd look for marginal ground connections first. If it used any fusible resistors, those often go high in value and need to be replaced. Then look at caps!
It's definitely audio hum, 120hz sounds about right. Don't have schematics. I do, however have particularly inefficient satellites (Aura Audio, WE-SAT, Finland), 4ohm 80W power handling. Their actually full range with a cap installed by the manufacturer to make them satellites.But the subwoofer also hums. It mainly occurs with quiet passages in classical recordings. I'm almost positive it's the PSU filtering.
I DON'T HAVE MUCH EXPERIENCE with audio, but I do do a lot with precision instrumentation. But then binning it isn't a bad idea, because I only need a 2-channel amp, not an AV receiver. And the amp section isn't that great to begin with. It's a very steady hum. Thanks for all the help.
Btw, what is a fusible resistor? Is it a mov?
I DON'T HAVE MUCH EXPERIENCE with audio, but I do do a lot with precision instrumentation. But then binning it isn't a bad idea, because I only need a 2-channel amp, not an AV receiver. And the amp section isn't that great to begin with. It's a very steady hum. Thanks for all the help.
Btw, what is a fusible resistor? Is it a mov?
so have you tried using contact cleaner on both ends of all the connecting cables?
Ok, we now know what speakers are being used..
But we're still in the dark about WHAT model Kenwood IS this thing?
But we're still in the dark about WHAT model Kenwood IS this thing?