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audio amplifier repair

  1. A

    I have an old Technics SA-380S lying around and I want to fix it

    Hi everyone, I'm relatively new to fixing electronics and amplifiers but I love listening to the sound produced from vintage amplifiers My dad had this Technics SA-380S lying around and I took it out trying to fix it. At first, it was covered in dirt, so I cleaned it with a blower(used for...
  2. M

    Beloved MCS 3865 Amp Right channel started popping. Thoughts?

    I have been using a Modular Component Systems 3865 in my workshop. It has plenty of power to drive my Technics SB-G800 (97 db/watt) speakers. Have used it for 2 years until the right channel just started popping loudly every minute or less. Needle jumps (yes, one needle still works on the watt...
    • MarkHaslett
    • Thread
    • amplifier audio amplifier repair mcs mcs 3865 modular component system amplifier troubleshooting amplifier
    • Replies: 10
    • Forum: General Audio Discussion
  3. D

    Right channel dropping out when adjusting selector switch on Marantz PM550dc

    Hey everyone, long time lurker but first time poster on this forum. I have some trouble with my Marantz PM550dc. The right channel keeps cutting out when the amplifier is running. When I adjust the selector switch, it can sometimes come back on for a certain period of time. Trying to put the...
    • DirtyRecords
    • Thread
    • audio amplifier repair channel cutout channel drop out channel issues
    • Replies: 3
    • Forum: Marantz Audio
  4. T

    Marantz receiver 2245 amplifier board oscillations.

    Hello I am working on Marantz 2245 board and trying to figure cause of oscillations when I increase supply voltage. This happened when voltage reach 21VDC or so and see HF oscillations of the sinusoidal signal. When DC is back down to 20.5VDC there is no oscillation . I have checked several...
    • Traverse
    • Thread
    • audio amplifier repair marantz oscillations
    • Replies: 18
    • Forum: Marantz Audio
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