jaybirdss396
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May 28, 2017 at 11:56 AM
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electronics tech

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jaybirdss396

AK Subscriber, Male, from Southcoast MA

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jaybirdss396 was last seen:
May 28, 2017 at 11:56 AM
    1. HAL9000
      HAL9000
      Hey ray,

      I would replace all the small signal transistors.
      usually one or more are defective.

      marantz put the original footprint on the boards. But used backward footprint transistors. Note that the newer transistor fit perfectly except for the Differential amplifier 2x7B ---> 7A fitting. these are the only two transistors that go backwards see photo's on my thread.

      I use: Bc546 556 and MPSA92 and MPSA42(high power section).
      and i think one BC 550 somewhere.

      Jon
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    Gender:
    Male
    Location:
    Southcoast MA
    Occupation:
    electronics tech
    hifi, anything mechanical (especially vintage) woodburning

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    VTA SP12 Preamp, Quicksilver Mid Mono Tube Amps 45WPC, Tekton Pendragon, Klipsch Forte, Technics SL-1200, Dual 1019, Pioneer Elite PD-F19 301 Disc Changer