OK. Replaced the 3 Capacitors last night. Put it back together and wired it up to a uhf base station transfromer........ and the tuning fork now hums away but it wont drive the the gear for some reason. Will try a few more things and see how I go.
They are called a tuning fork mechanism. They were designed in the 40's by an English clock making company. JECO of Japan built them and they supplied Smiths with the same mechanism for their clocks.
The tuning fork vibrates when the coil is energised which then drives the clock. This is why the clock hums and is also why the clocks do not tick like a conventional clock.
So our true blue Holdens are running a Japanese clock and strangely it is the most unreliable gauge in the dash!
When you pull the adjusting knob it gives the mechanism a helping hand to start, so if you have had the battery out for a while its not a bad idea to give the clock a flick with the adjuster to get it started when you hook it back up.
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