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Ekco CR280 valve/tube car radio

Discussion in 'Electronic Repair' started by N_Cook, Jun 14, 2008.

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  1. N_Cook

    N_Cook Guest

    A long time since looking at such a radio
    to check-over/repair as no known history and not powered up in any way
    Took apart section by section with bits in separate labelled bags
    I will test the valves later today
    ECH42, EF41, EBC41,EL42
    Seems surprisingly good condition inside. Will have to replace the 12V (-ve
    supply) lead and speaker lead as perished and the on/off switch is ohmic.
    The vibrator had obviously been removed at some point (putty-stuff is split)
    in the past. what to look out for when testing these and how to remove that
    putty-like goo if necessary, warming with hot-air?. I assume test with load
    attached but what to do if a problem within the vibrator.?

    What ohmage speaker? 2.5, 3 or 4 ohm ?
    Could measure primary R of the output matcher more accurately if any help
    but primary 692 ohm and secondary between 0.1 and 0.2 ohm
  2. N_Cook

    N_Cook Guest

    3 of the valves tested fine but the ECH42 was very C/H leaky but I happened
    have one of these valves lying around
  3. ....

    I doubt there's much chance of finding a replacement vibrator these
    days, if its contacts have gone. I wonder if anyone has come up with
    a design for a solid-state (plug compatible) replacement?

  4. N_Cook

    N_Cook Guest

    I have some schema for similar Ekco CR... radios and the vibrator would seem
    to contain a valve or 2 inside as well as coil and bell-mechanism.

    If you can get inside the can , do they have oil or anything inside ? under
    that goo would there be a contact adjustment aperture ?
    A long time ago I seem to remember trying to deal with one where the contact
    make-break was very irregular and I never could make it work properly
  5. I've only ever taken one radio vibrator apart. It looks just like
    a small relay inside a soundproofed can (foam inside). There's a mass
    sprung on the arm, to make it mechanically resonant, plus two
    changeover contacts and one contact in series with the coil.
    Total 6 connections (one terminal is common on both changeover
    contacts and the contact in series with the coil.

    There is a mechanical adjustment screw for the NC contact to the coil.

    It has no "goo" or "oil" or anything like that, just a crimp at the
    bottom of the can onto the paxolin base on which the pins mount.
    Surprisingly, the foam rubber stuff looks as good as new, this
    one must be at least 50 years old. I could imagine some other
    rubber compositions could turn to "goo" by now.

  6. sparky

    sparky Guest

    Many vibrators have adjusting screws inside them.
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