When I switch the amp on it makes a loud buzzing sound that comes from within the amp itself and also comes though the speakers. It gradually fades away over a couple of minutes. What could be causing this? I have checked all my connections and everything seems fine.
This sounds like a problem with the protection circuit, and/or the speaker relays. More specifically, a capacitor within those circuits that is not behaving properly. I strongly suggest having it looked at ASAP.
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I have a Kenmore upright freezer model # 253.26052104 and at the bottom of the front there are two lights and an on/off rocker switch. At this time one light is ... When I attempt to turn it back on, it makes an extremely loud buzzing sound. What does that... The switch that you are describing is for the high temperature alarm.
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A common cause are failure of decopling capacitors in the audio section, and or the circuit board power distribution that feeds the audio board. Most of the capacitors are surface mount components. The standard fix is to start by changing the circuit boards that have the defective parts.
If the set is under warranty, call for warranty service. Out of warranty service is expensive for these TV sets.
IF this is a vacuum tube unit, these symptoms are that of a tube that the heater is intermittent, that is it cools off due to a break and then liights again.
Open the back and observe the heaters in the tubes. DO NOT be fooled by some that have TWO heaters in them. (use a mirror if necessary) A single one that comes and goes can cause the problem and the voiration can make it come and go. This behavior in a tube is NOT somthing readily spotted in a tube checker. The delay in fading and coming back would be the delay in warm up following a heater going out and cooling.
Unplug everything apart from the speakers that is plugged in to the amp and check the wiring of all the connectors. If the buzzing stops when you do so then it is most likely one of the input connectors or cables causing the problem and it is most likely that the shield or earthing wire in one of those cables is aft faulty and needs repairing or replacing. If the buzzing continues try switching the input selector to something else to see if it disappears. If it does then the input channel that causes the buzzing may be faulty and need repairing and if it does not then the amp itself has an issue and will need repairing. In this case it may be a faulty power supply, preamp or main amp module especially if it comes from both or all channels.
Sounds like a ground loop issue. Make sure to separate the cables as much as possible or bring them up off the floor if you can. Also, make sure you haven't inadvertently crossed + and - so make sure to check that on all your speakers.