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I purchasedĀ my one from a clock repairer in Staffordshire then I had it fully refurbished by Graham Baxter (http://www.delphelectronics.co.uk). HOWEVER he no longer re-furbs them as there is not enough demand or profit. He still Ā produces watch timing software. I now use a cheap Indian cleaning machine (JANTA) which is a copy of aĀ Elma which gives me excellent results.Ā 

PS is you enter L&R or Varimatic in the search box on this site there is lots to be found on this machine.

1359787341_Screenshot2019-02-0609_09_33.png.593f8567598557a744e10bf7b03e32a2.png

JANTA

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I've actually got quite far, have managed to get hydraulics sorted and the synchronisation.

On to the ultrasonics.

Now the ultrasonics light did not come on, the fan kicks in so the switch is working that starts the ultrasonics.

The bulb light up for a few seconds and died.

I have found a replacement and am waiting for it. However the dial control looks to not being doing anything at all.

Does some one have a pic of the underneath with that bit in particular. I want to make sure nothing is missing as I do not see how it would do anything as it looks like a loose switch ( bit at the front)

Thanks in advance

eb0f82f199752a7a048ebafbae250051.jpg71aaed7b1caba153c74299ef6326299c.jpg

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Thanks clockboy , I do have this document , just need some detailed pictures to see if there is a part omissions in the front switch as I don't understand what it actually does!

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I was told by the guy who re-furbed my L&R that the originalĀ wiring is suspect with NO earth. So he re-wired it, I do not understand electrics so I just took he word for it. What I do know is when it is up and running it is a great machine and cleaning a watch is almost a pleasure.Ā 

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  • 3 weeks later...
Quote

Is that big glass bottle a valve rectifier?

It is a single valveĀ  oscillator. I would have suggest high voltage leakage testing and if necessary replacing any capacitors before you even attempt to power it up (but I'm too late I believe).

Ā 

Screenshot at 2019-02-28 17-09-57.png

.. and of course be careful around the ultrasonic circuit, those are pretty high voltages.

The light bulb is quite probably an active part of the circuit.

Edited by AndyHull
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4 minutes ago, jnash said:

Yep replaced valve, then capacitor s blew

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Ā 

The dodgy capacitors are the reason the original valve blew.

When fixing old valve gear, always start with a test and replace of capacitors.

Resistors rarely go badly out of spec, and when they do, they generally increase in value, but capacitors are far more likely to be leaky, or wildly out of spec. and that introduces DC in places where only AC should go.

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1 hour ago, rodabod said:

1450V on the secondary..... F* that!

I wouldn't recommend that, nor indeed licking it. However since you don't actually need to touch it when it is switched on, you should remain completely unf*d.

Observe some simple precautions and you should be perfectly safe. Its a bit like crossing the road. You shouldn't do that with your eyes shut, and neither should you work on high voltage with the power on.Ā 

Keep your left hand in your pocket if you decide to prod things with anything remotely conductive, that way if you do get a tingle, it doesn't go through anything vital (like your heart).

The circuit is relatively safe in the sense that you can see all the bits that will bite you. Its not like working on large switch mode power supplies, X-ray equipment or colour CRTs, which can be pretty angry, even several hours after being switched off.

You might like this Youtube channel. He is old school like me, and works on tube equipment and CRTs. He is a little more blase about touching stuff that I would be paranoid about. He does work with an isolation transformer however, which I would recommend if you are planning on doing much work with anything over about 50V.
Ā 

BTW Colour TVs work on up to 30kV plus. Even monochrome CRTs use several kV

X-ray tubes go even higher. The xenon flash tube in a small compact camera can blat you with a couple of kV if you are not careful. Don't ask me why I know.

Edited by AndyHull
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I have been following this post with interest as IĀ have a varimatic which at present is inĀ garage waiting a fix. The guy who originally re-furbished the machine said the originalĀ wiring wasĀ poor and dangerous. When I purchased the machine it worked for a while then it caught alight and blew the houseĀ fuse. Ā If I remember correctly the original wiring circuit was was not earthed.Ā Ā 

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