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cleaning and rehabbing a tek scope

Discussion in 'Electronic Basics' started by zeitguy, Feb 23, 2006.

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  1. zeitguy

    zeitguy Guest

    Can anyone point me to a website that walks you through the details of
    cleaning and rehabbing an old scope that seems to work but is a little
    crudded up and has some pots that don't respond, or seem intermittant?
    I have the original manual, but I am looking for "tricks of the trade"
    regarding using or not using contact cleaner, treatment of the old
    tubes, etc.

    (It is a tek 585a if you are interested)

    Thanks. My use of Google has uncovered a few fairly dormant sites and
    an interesting anecdote or two, but nothing very methodical.
  2. John  Larkin

    John Larkin Guest

    The first thing Tek service centers did to older scopes was to wash
    them. Remove side covers, spray with detergent, wash with a strong
    hose, then bake dry. You could bake in a cardboard box fed by a hair
    dryer or something, but make sure it's fresh, dry air, not
    recirculated humidity. You can remove tubes first, and clean them
    separately in a dish washer, but put each one back into the same

    A good contact cleaner works great on scratchy pots and flakey rotary
    switches. If you wash the scope, use contacty cleaner on all the pots
    and switches to leave a little anti-corrosive film.

    The 585 was an impressive beast. The distributed-deflection CRT is a
    work of art. I prefer the 547, personally, for shear electronic

  3. ehsjr

    ehsjr Guest
  4. tekamn

    tekamn Guest

    Washing the scope completely. The yahoo group has some nice articles,
    or you can buy the book that is recommended there.

    For schematics, manuals: and it's mirror site(s).

  5. zeitguy

    zeitguy Guest

    Thanks for the hints. I think I might skip taking out all the tubes
    based on some advice I have received, but the other contacts are
    definitely in for a wash.

    Since I need a 1A7 amplifier plug in, which was made for the 54x
    series, I am now looking for an 81 or 81 adapter and the plug in, which
    complicates things.

    Has anyone hauled this vintage box into a diy car wash on the original
    cart? It would make a great photo. Maybe I will do that.
  6. zeitguy

    zeitguy Guest

    That has been brought to my attention now, and is already become a
    source of help. Thanks!
  7. Rich Grise

    Rich Grise Guest

    I wouldn't use a pressure washer, especially not the one at the car
    wash. The blast is WAY too hard. I wouldn't spray it any harder
    than, say, a shower head, or even that sprayer thing in the kitchen

    And don't _bake_ it dry! BLOW it dry! Use clean, dry, unoiled compressed
    air - _then_ let it drip-dry or use warm air. Even distilled water can
    leave water spots if you leave drops behind - the water absorbs crud
    from the air, and deposits it when it evaporates.

    Good Luck!
  8. John  Larkin

    John Larkin Guest

    I'd be seriously concerned about leaving any water in the HV
    multiplier section.

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