Hi I have 4 BOSE 1800 series V amplifiers. They all cut because of overheating. They have been stacked fairly close together in a PA rack, limiting the air circulation a bit. However, the fans are changed and work perfectly for all amps. The amp chassis gets so hot that you can fry an egg on the top. After a good ½ hour they are back working again for 10 – 15 min. before the misery is back. Do we have a capacitor problem here? Old and dry capacitors making the amp units consuming much more power compared to a new amp? Also the amps give off a constant humming noise independently of volume magnitude. These amps are quite expensive to replace, so we want to mend them instead of throwing away.
The capacitors in the power supply might indeed cause the humming noise. This could be the 50Hz mains hum getting in.
I can't tell you if having four amps on top of each other is the cause of the problems your experiance. What I can say is that anything running at temps to fry eggs is a fire hazzard. And that might mean extra cooling is needed if you want to be safe. You should also check each amp. I would do this by seperating the amps to see if one of them is making more heat than the rest. If that is the case then you might have a part - a semiconductor - that has a thermal problem.
The capictors will fail if they are having to deal with excessive heat also, that's if the amps don't burn the house down first!
SOURCE: Kenwood stereo control amplifier KC-206 doesn't work
I was able to use an universal remote control that I have, a Radio Shack Kameleon 6 in one remote control which I was able to program to run the audio portion of the Kenwood KC 206 control preamp. By adjust the remote sensor volume to max, I was able to get maximum volume out of the unit and drive the power section very nicely. Now I have to get up and manually turn the manual volume control for addition volume adjustment.
Hopefully Ken can find a remote that he can control the Kenwood control preamp the same way I did. Good luck here.
SOURCE: Kenwood stereo control amplifier KC-206 doesn't work
I found this thread when I was having the same problem with mine. Turns out that it's sort of a problem, but not really. Looking at the manual (which I found in another google search) I believe a "4" on the volume level corresponds to a default remote control setting. The remote varies the level between 0 and 10, but the "10" corresponds to the maximum volume setting on the preamp. So it actually works, it's just that the "4" reading doesn't change. There's probably a pin you can short somewhere to make that default to "10" which would be ideal. But I'm not sure where that is. Now on to my other problem. This particular preamp has a subtle 120 Hz hum...
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