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Hiss from Marantz PM7000/N2B amplifier

Serge -  
sawsix Posted messages 4824 Registration date   Status Member Last intervention   -
Hello,

My 13-year-old amplifier has been crackling recently regardless of the source (CD, FM, AUX). This crackling diminishes a bit after several minutes of operation but comes back randomly. The crackling mainly concerns the right channel.
I am thinking of disassembling the amplifier and blowing air on some components with a contact cleaner to see where the problem lies.
If you have suggestions on specific areas to focus on, I thank you in advance.
Best regards,

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1 answer

  1.
    sawsix Posted messages 4824 Registration date   Status Member Last intervention   1 035
     
    Good evening,

    This could be from a capacitor or a transistor, as you mentioned, first clean it with a small gas blower to check the capacitors; fuse; also see if there are any scorched components.
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    1. Serge
       
      Thank you sawsix for the leads, I will test them tomorrow. Otherwise, I just switched the speakers and now the system is working normally whereas a minute ago the sound was terrible on the right speaker. The problem is random.
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      1. sawsix Posted messages 4824 Registration date   Status Member Last intervention   1 035 > Serge
         
        This problem is common with transistors in their final stage. But it's not the component that costs the most in the amplifier; it is equipped with two Toshiba transistors (at €12 each), a pair of capacitors (at €20 each), etc., it adds up quickly, we'll see.
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