On 2008-06-15, N_Cook wrote:
Remove _ for valid address wrote in message
...
On 2008-06-14, N_Cook wrote:
...
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.?
...

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?

Mike.

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

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.

Mike.