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Bent trace on a Tek 465 scope

Discussion in 'Electronic Repair' started by Mr. Land, Jan 3, 2008.

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  1. Mr. Land

    Mr. Land Guest

    I have a very old Tek 465 scope that I picked up many years ago in a
    surplus sale.

    It works just fine, but it's always had a small anomaly...

    If you center a trace vertically on the screen, the left end of the
    trace (about 3/8" worth) bends slightly downward.

    If you move the trace up away from vertical center, the bend goes
    away, and doesn't occur again all the way to the top.

    If you move the trace down instead, the bend also goes away, until you
    reach the extreme bottom, when it then bends upward slightly.

    This effect happens on either channel, and seems independent of the
    vertical gain or sweep frequency.

    I'm wondering if this would be indicative of some internal damage to
    the display tube, or (hopefully) some defective/drifting internal
    component that I might replace.

    Thanks for any advice...
  2. Jim Yanik

    Jim Yanik Guest

    IF all your power supplies are good;regulating and no excess ripple,then it
    sounds like a bad CRT,with internal damage.

    if you input a fast rise signal and set the sweep time/div to display 1
    edge per division,you may see just how much the geometry is distorted.I've
    seen some very bad ones.Time marks were often used for this.

    The CRT is spec'd to the center 8 div,BTW.Outside of that,linearity is not
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