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Old 02-12-2012, 08:13 AM #1
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Default MELLES GRIOT 05-LLR-831 10mW max HeNe Laser - eekBay

Just found this:

MELLES GRIOT 05-LLR-831 10mW max HeNe Laser - eekBay

Thought it might be interesting for someone looking for parts or who might be able to get it working again.

There's more than one up for offer. They're up for $45 but you can make an offer on them.

Lase


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Old 02-12-2012, 08:34 AM #2
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Default Re: MELLES GRIOT 05-LLR-831 10mW max HeNe Laser - eekBay

But the real question is how hard is it to get them to laze
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Old 02-12-2012, 11:30 AM #3
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Default Re: MELLES GRIOT 05-LLR-831 10mW max HeNe Laser - eekBay

I don't know but they accepted my offer of $20

Much better than the original price of $325.00

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Old 02-12-2012, 11:39 AM #4
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Default Re: MELLES GRIOT 05-LLR-831 10mW max HeNe Laser - eekBay

The part number says to me it is probably a 5mW Laser.
I could be wrong.... but Googleing that part number only
comes up with 5mW.


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Old 02-12-2012, 11:49 AM #5
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Default Re: MELLES GRIOT 05-LLR-831 10mW max HeNe Laser - eekBay

Yeah I know. I looked it up on the Melles Griot website.

They do only state 10mW max and that they can't fire them up or test them though. They don't even list the wavelength. So I'm guessing the seller doesn't really know what he has.

Here's the link to the original product page. Link

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Old 02-12-2012, 09:10 PM #6
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Default Re: MELLES GRIOT 05-LLR-831 10mW max HeNe Laser - eekBay

maby the tube still works if it does then its got a chance. have fun
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Old 02-12-2012, 11:00 PM #7
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Default Re: MELLES GRIOT 05-LLR-831 10mW max HeNe Laser - eekBay

The problem with these units is they contain the PSU and have no external HV wiring. I know what you're thinking... "how is that a problem". It is a problem because it means it would be obvious if there were working or not. Chances are they've either got degassed tubes or burnt out PSUs. Since these are sealed all in one units the most common problems of frayed/broken/shorted/cut cables are eliminated. Those common problems are often what allows old lasers like these to actually be worth while for hobbyists like us to buy. We can easily fix those problems and get the unit lasing again.

So, good luck! If you buy one of these there is a much higher chance of it not working than if you were to buy an 05-LHR-911 style HeNe head.

Also, their international shipping prices are really high! $60 to AUS!
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Old 02-12-2012, 11:07 PM #8
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Default Re: MELLES GRIOT 05-LLR-831 10mW max HeNe Laser - eekBay

Thanks for that +1

I've got one on it's way so it'll be a project to fiddle with and learn with before playing with the ones I bought off you. By the way, were they the 05-LHR-911 style?

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Old 02-12-2012, 11:15 PM #9
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Default Re: MELLES GRIOT 05-LLR-831 10mW max HeNe Laser - eekBay

Yep, they were. Those style heads are the easiest to repair as long as the tube is still functional. Getting the tube out of the head is an utter hellish nightmare though, haha. I've done it twice... never again. Typically they don't degas as fast as others either since equilibrium is reached inside the air tight head, which further increases the lifetime of the tube. They are truly ideal for the hobbyist market, especially since when they are removed they typically only have the HV cord cut and nothing more (because accessing the internals is a nightmare!).

When all in one units are decomissioned sometimes the internal electronics are intentionally fried for the same reason the HV cords on the 05-LHR-911 styles are cut, and a cut cord is way easier to repair. What the reasoning behind destructively decomissioning a working laser is... is beyond me. I still can't wrap my head around that other than to perhaps prevent employees from stealing and reselling.

Thanks for the rep! =)
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Old 02-12-2012, 11:20 PM #10
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Default Re: MELLES GRIOT 05-LLR-831 10mW max HeNe Laser - eekBay

Quote:
Originally Posted by Sigurthr View Post
When all in one units are decomissioned sometimes the internal electronics are intentionally fried for the same reason the HV cords on the 05-LHR-911 styles are cut, and a cut cord is way easier to repair. What the reasoning behind destructively decomissioning a working laser is... is beyond me. I still can't wrap my head around that other than to perhaps prevent employees from stealing and reselling.
It doesn't work that way though :P They still end up in our hands somehow.

I'm going to take one of the tubes out of the head. I'm just doing a lot of research on it first. I've heard it can be easy or hard depending on the head.

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Old 02-12-2012, 11:27 PM #11
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Default Re: MELLES GRIOT 05-LLR-831 10mW max HeNe Laser - eekBay

The ones I sold are all high-temp Silicone RTV potted. There are holes around the circumference of the head body where the silicone is pumped in. It then adheres to the tube (weakly) and the aluminum walls of the head (strongly). There are two methods of removal... one is to take a thin and long strip of stainless steel and shape it to the curve of the head and use it to cut the RTV from the walls of the head. The other method is to open both ends of the head (the aperture end is epoxied - not easy to un do!) and use a piano or nonwound guitar wire to cut the RTV. Both methods take forever and steady hands. Good luck and have fun! (Btw, the head wrapped in electrical tape has part of the work already done. Whoever owned it before I bought it gave it a go but didn't get very far, so that may be an ideal one to start on. The reason for the tape wrapping is to make the head air-tight again.)
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Old 02-12-2012, 11:30 PM #12
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Default Re: MELLES GRIOT 05-LLR-831 10mW max HeNe Laser - eekBay

Cool thanks

I still have some cheese wire somewhere from when I worked as a chef. Might give that a go.

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Old 02-12-2012, 11:44 PM #13
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Default Re: MELLES GRIOT 05-LLR-831 10mW max HeNe Laser - eekBay

I bought one of these from the same seller. The tube is good but the brick power supply squeals real bad and after a few seconds on the beam starts to dim and flash real fast.
Don't know what to do to fix it.
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Old 02-12-2012, 11:47 PM #14
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Default Re: MELLES GRIOT 05-LLR-831 10mW max HeNe Laser - eekBay

sounds like a frequency problem
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Old 02-12-2012, 11:55 PM #15
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Default Re: MELLES GRIOT 05-LLR-831 10mW max HeNe Laser - eekBay

Aye either that or since these are high mileage tubes they require more current to stay lit once the negative resistance kicks in. That is a common symptom of high mileage tubes (higher current draw to stay lit). Either way you're looking at a new PSU. You can try adjusting the ballast resistance, sometimes going up or down a few ohms will let it run longer. It really depends on how much current the tube really wants.
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Old 02-13-2012, 12:20 AM #16
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mattco2 has much to be proud ofmattco2 has much to be proud ofmattco2 has much to be proud ofmattco2 has much to be proud ofmattco2 has much to be proud ofmattco2 has much to be proud ofmattco2 has much to be proud ofmattco2 has much to be proud ofmattco2 has much to be proud ofmattco2 has much to be proud of
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mattco2 has much to be proud ofmattco2 has much to be proud ofmattco2 has much to be proud ofmattco2 has much to be proud ofmattco2 has much to be proud ofmattco2 has much to be proud ofmattco2 has much to be proud ofmattco2 has much to be proud ofmattco2 has much to be proud ofmattco2 has much to be proud of
Default Re: MELLES GRIOT 05-LLR-831 10mW max HeNe Laser - eekBay

JDSU High Voltage Helium Neon HeNe Laser Power Supply 1250V DC 4.0mA HV 10KV | eBay
might be able to throw that in the mix for some fun
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