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Yamaha fifty 210, G50-210

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  • Yamaha fifty 210, G50-210

    Same series as the G100, etc. One of my favorite solid state amps by far.

    I used to have the 410, the 212, and the 210 . . .

    The 210 has an issue no one can seem to figure out. I put it in the shop for months and they changed several out of spec componants, and yet nothing changed.

    When I got the amp, one of the speakers was blown frozen-- voice coil unmovable.

    ANYHOW, here's the issue: When you play a chord, and let it ring, instead of dying away gracefully, it dies away quickly with a nasty solid state distortion.

    Before my hundred 212/G100-212 was stolen, I tried switching the heads. The problem followed the head.

    Any thoughts?

    If anyone wants to try their hand at the thing, I'll happily ship it!

  • #2
    Yamaha G50

    Do any of the front panel controls effect the distorted decaying signal?
    Does it occur on both channels.
    Does Reverb on or off effect it.
    Right below TR301 & 302 on the power amp page, is an adjustment pot labeled output waveform. This sets the top & bottom of the signal that they are symetrical. Was this pot turned?
    The other two pots are for idle bias & carrier voltage. I forget what that (carrier V) one is set to.
    Did any of the techs isolate the problem to either the power amp or the preamp?
    Attached Files

    Comment


    • #3
      Sorry, it's Series I, only 1 channel.

      Comment

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