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Kundo Kundo clock won't work

ptolemy

New Member
Apr 11, 2017
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I've got a Kundo clock which doesn't work. A clock shop near me advises that it looks complete from the photographs but it might be the coil which has failed. Any ideas where I can get one please and is it easy to fit? 301488.jpg 301489.jpg
 

Tinker Dwight

Registered User
Oct 11, 2010
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There were two types of transistor clocks. The newer ones
used an external circuit board and the coil assembly was only a coil.
This type used a single coil winding and two transistors plus some
components mounted on the external board in the base.
The older type has the transistor and resistor inside the coil assembly.
These used the two coil windings as shown in the pictures, if you follow
the pointers in the treads.
The coils are wound with #42 magnet wire ( smaller than a hair ).
The original coils have a clear potting material holding them to the bobbin
and can not be unwound easily without breaking the wires.
The common failure is not the transistor ( although I worry some about your
battery holder. they are designed to run on 1.5V ) but the coil going
open. This is caused by the insulation decomposing and creating a corrosive
material. The wire I'm talking about is the fabric wire covered wire producing the
corrosive material not from the magnet wire. The magnet wire is what fails.
These coil assemblies are not available any more and haven't been manufactured
for years.
They can be rebuilt. see :

http://sound.whsites.net/clocks/kundo.html

He doesn't describe how to open the coil.
The tube in the center of the coil is crimped over at each end.
One can carefully fold back the tube, at one end, and take the ends off.
Tinker Dwight
 
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