Question about Lexicon LX-7 7-Channel Amplifier

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Lexicon Lx-7 buzz sound

I have a LX-7 amplifier wich present a subtle buzz sound through each one of the seven channels even do there is no input signal just the speakers cable were connected. Can somebody help me...?

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Hi chupetin2

If the problem is present with ONLY the speakers connected, that is no other powered devices like subs, or input/output cables, it will be a power supply problem inside the amp. If you have electronic fault finding skills, there will probably be a capacitor in a regulated rail that has failed.
If you do have a sub connected, be sure it is powered from the same mains source as the amp, or at least a GPO that is on the same phase. Different phases will induce mains hum, as will multiple earths. Try also temporarily moving the amp(whilst monitoring the hum) from where it is sitting and see if the hum is being induced into the amp by any other devices

Happy to talk to you more about this. Just ask:)

regards
robotek

Posted on Aug 19, 2008

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