There is a buzzing sound from my new Lenovo power cord for the T400. It is 65 watt I believe. Basically you can hear the electricity just buzzing through the cord. Sounds odd. It is as if it is going to crackle and sizzle some day soon. Thoughts? Colm

watts = 0.8 × 2A × 120V = 192W
watts = 0.8 × 1A × 120V = 96W
watts = 1 × 1A × 120V = 120W

There are many causes of buzz, so it should be checked step by step :
- Bad connection on the input connector, or cord.
- Amplifier, basically have the block diagram like this. View image.
If in one block damage, buzz can be heard.In the amplifier.
Generally occurs in the PSU and / or power amplifiers.
Fix it to the experts,because it requires a good knowledge of electronics.
Blown speaker cone, does not cause a buzz.
Short circuit along the wires supplying the audio, it will not cause any sound in the speakers, including the sound of music.
Try also, disconnect the input connector, whether the buzz is still audible. If after the input connector is removed, the buzz disappears, the possibility of buzz came from another device before the amplifier.

I had a similar problem and it was because I had OVERFILLED the oil! I drained enough to make sure it was within the crosshatched markings on the dipstick and it started right up.

If the magnetron was making louder noises prior then replace the magnetron. While the cabinet is open make sure to look for burned wires, check the continuity of thermal cutoffs, and check the main circuit-board for burned traces or components. The relays in most electronics are known for arcing (spot welding) and staying in the wrong position. Tap them hard with the back end of a screwdriver.
You may have to replace the capacitor too. During all of this use safe electrical practices by having the power cord unplugged. The capacitor could still have a high charge on it so be careful.

Well, you aren't going to like this... You have a system that can deliver 250 Watts maximum RMS BECAUSE that is ALL the input power there is from the power cord. All these numbers like 800 watts a side are BS... those are PEAK power and not sustained power... More basically fake advertising that we are so accustomed to lately. The good thing is you won't blow your speakers.

The clipping is the internal protection that limits the amp from saturating.

I know you aren't going to like to hear this after spending that much... If you want more power you will need to buy another amp to get the higher sound level and use this as a mixer... One side of this should be able to drive 125 watts which SHOULD be enough to use for monitors. You should procure a sound level meter and make sure you are staying within the sound level guidelines now to protect your hearing... I know of several musicians that now are near deaf due to exposure to high sound levels...

okay so buzzing noise. i have seen this once before. the extension cord feeding a power strip with two amps plugged in and powered on off of a low amp electrical outlet with fluorescent lights overhead.......try running only one power unit off of the electrical outlet you are using, just one straight into the wall with the lights out. if you still hear it i wonder if the output transformer is starting to go south. if you listen close sometimes you can hear the buzz of a transformer powered on, example: you can hear the buzz of a power transformer on a power pole in peak hours. tubes usually make hisssing, crackling type noises. next would be to tap on the tubes while in play with an orange stick or pencil eraser to listen for microphics or the tapping itself thru the speakers. if you hear with out a doubt change them.

Is this only with CD, only with THAT CD, or with nothing in particular selected or playing?

Check all connections for tightness as bad cable shield connections will let emitted noise into the system. Ditto for signal or speaker cables routed near power cables, TV's, other electrical sources.

Sometimews reversing the AC power cord polarity can resolve buzz/hum.

I have had then same exact problem, except I had an ihome. I've done research on it for a way to fix it. basically what I have come to find is that the plug for the ipod is just cheaply made, and that there is basically no easy and cheap fix for it. However as long as you have an aux-in you can just simply avoid the problem by buying an eighth inch to eighth inch cord so that you can just simply plug you ipod into the aux-in. As long as you have the ipod plugged into the the aux-in, and aux mode is selected, it should play your music while charging.

Make sure you have a ground prong on your power cord. Most input jacks nowadays are closed circuit. They have a switch built in that won't allow any sound without the cord plugged in. You may have a damaged jack that will give you a loud hiss, a loud hum or crackling depending on what volume your controls are set at.

Is there a loose connection anywhere?