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L & R Maxomatic Ultrasonic


JerseyMo

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Has anyone here worked on an ultrasonic such as this one?  L&R Maxomatic..

I was told it will smoke when powered up. After opening it up I pulled the tube and right away I see it failed because the top cap fell off!

Also I noticed debris inside which of course is not a good sign either.  

So what to do?  I found a used tube for BIN at $20.00 and best guess is the machine is maybe worth $40.00 Is it something I should get into just for the fun of it?

Heck yeah, what is the worst I can be other than burning down the house :)

 

 

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As long as your competent with mains electricity wiring and your doing it just for yourself, go for it.

I don't know what the electrical laws are in the USA, but in Australia you would actually need a restricted electrical lenience to work on something like that.

A valve driven ultrasonic cleaner, that a first on me, I didn't even know they had been making them for that long.

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Hi  Guys  I have an international ultrasonic valve driven  the machine works ok but the ultrasonic does not, Bought as a project several years ago still waiting to be done. I will post some pics sometime..  As JerseyMo's one is a single valve, get stuck in and have a go, It might make a big bang so power it up in the yard.:D

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I was told the machine was made in 1975 but did not verify that.  No matter as I did go ahead and order a replacement tube. Someone else advised to replace any electrolytic caps. But, there are only two disk caps inside.  

I am assuming 'valve' is the same as 'tube'?

License?  Sure I got one of those!  

forgot to mention - you see the maker is located in Kearney NJ.  that is just a few miles from where I picked this machine up.

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20 hours ago, luiazazrambo said:

If this is the same as yours ( nawcc ) the schematic might help you. If there is smoke there is a reason for that and you probably have to eliminate that otherwise you will end up replacing parts in an endless loop.

 

Thanks, I came across that data sheet as well. The tube replacement will be as far as this repair attempt will go.  

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Hi   here are a few pics of my ultrasonic bought some years ago as aproject, got to get it done.

Its a british made National ultrasonic watch cleaner, It all works,motor,heater. The ultrasonic is dead and there is no life in the Valve(tube)  812A  Amplifier so the clean up begins an then I shall get a valve for it..

What was the one you got JerseyMo, was it the same an 812A,?...

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6 hours ago, watchweasol said:

Hi   here are a few pics of my ultrasonic bought some years ago as aproject, got to get it done.

Its a british made National ultrasonic watch cleaner, It all works,motor,heater. The ultrasonic is dead and there is no life in the Valve(tube)  812A  Amplifier so the clean up begins an then I shall get a valve for it..

What was the one you got JerseyMo, was it the same an 812A,?...

 

Yes, I found a 812A on ebay.

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43 minutes ago, watchweasol said:

Hi JerseyMo     I dont know if you have the schematic for the L&R machine.  I found this whilst researching my national, Its not over good but better than nothing  if you are without.       Cheers 

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Thanks,  the cleaner will be going back to work at my watchmakers shop. He had given it to me for an 'AS IS' sale on ebay. but of course I could not resist to take it apart and figure out why it was not working.  I should have told him it was just 'over wound'  and needed a servicing.   :)

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Nicely done.

Yes Valve and tube are the same thing, I still find it amazing that we can all be talking the same language and sometimes still not know what each other means. due to georgraphic variations of some words.:D

The one that creates the greatest confusion between Australia and the UK is the little rubber 'shoe' you put on your feet.

In the USA I think you call it a 'flip flop' in the NZ they are called Jandles (No idea why), in Australia we call them 'thongs' which I know in the UK and I think the USA is skimpy bathers which in AUstralia are called G-strings.

You can imagine the looks I got when I first went to the UK and told people that in the summer in Australia it was generally too hot to wear shoes and so I would usually just wear my 'thongs' :D

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according to Urban Dictionary

After a japanese swimming team came to NZ (many decades ago), one observer was so impressed with their style of footwear that he began making them himself - he came up with the word "Jandal" as an abbreviation of the term "Japanese Sandal"

 

 

 

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