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marantz 4400 scope

  1. T

    Marantz 4400 Scope: Testing modern substitutes for 2SK30

    Hello. I am repairing a Marantz 4400 oscilloscope circuit. I would like to report the result of testing some modern FETs in place of some shorted 2SK30s on the 'scope board. The horizontal channel FETs were shorted while the vertical channel was fine. Rather than trying to find NOS or...
  2. M

    Help with Marantz 4400 scope

    Hi, there I recently picked up a working Marantz 4400 with a non-working oscilloscope. I checked the power supply board which had seemingly had a recap at some point in the past (rubycon, nichicon caps). I checked the connector too which some people have said has arching from the plastic and...
    • Mecrookie
    • Thread
    • marantz 4400 + scope + issue marantz 4400 scope
    • Replies: 35
    • Forum: Marantz Audio
  3. havols

    Marantz 4400 - Scope turned on at first time after 8 years

    Hi Guys I have a marantz 4400, and the scope never worked. The fuse always blew when 4400 turned on. After some help from AK members, I found the problem, a carbon track on a black power supply plug (pictured). I removed the carbon track, and reinstal the plug. Now, i install a new the fuse and...
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