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Siemens HeNe glass tube LGR 7641 & Metrologic PS type 37157

skjult

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Look what I found in my goodies bin. Made in West Germany - so that tells you the age.

I think I picked these up in the early 90s. I recall they worked but I’ve misplaced the instructions on the power supply. If you’ve seen one of these let me know the color codes. I believe it is black -, red +24vdc and white is the cathode. I believe the anode of the tube is the non shielded end and the cathode is the end with the fill valve. But as I recall with the metal tube I had, the aperture end was the cathode and the anode would be toward the full end. I’ll look for some data tomorrow.
 

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paul1598419

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On my Siemens tube the shielded end is the cathode. Not familiar with that particular PS, but I believe you can figure it out IF it does take +24 volts.
 

Anthony P

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I have something very similar. red+, black-, yellow -. black and yellow connected together then to -. The output is the end where the capillary is visible +. Ground is where the silver cathode is visible. mine is lgr 7655 and power supply is 12v. Since I got mine out to check, I may as well let it run for a while.
 

paul1598419

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The PS for mine is fused and uses 110 AC, so no problems with that. My guess was the same on which wires would be used as inputs and outs. Glad you found the instructions.
 

skjult

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I have something very similar. red+, black-, yellow -. black and yellow connected together then to -. The output is the end where the capillary is visible +. Ground is where the silver cathode is visible. mine is lgr 7655 and power supply is 12v. Since I got mine out to check, I may as well let it run for a while.
Thanks much! Will be interesting to see how that old potted power supply powers up after 20 years in storage. May stand back several feet.
 

hakzaw1

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Hope it lases--green HeNes are much sought after---I had to bid on a bunch of greens (Reos I have two)--Yellow ( I have a 6mW) and orange are even rarer.. (still looking for one) my yellow was sold to me in at hemay have sold the at a SELEM by the good Dr Sam himself--far from cheap but I consider who & where I got it as added value.
Had you not found that paperwork you could have found it at Sam's Laser --our GURU and keeper of our Laser Bible and a very helpful & large amount of info.. Everything cross referenced--Just by measuring the tube you could have found what it is--also he likely has one for sale --he asks a lot but warrantees them himself. Free repairs for life.

Long Before I met Sam I sent him a message with link to an ebay HeNe-- no PS--sold as untested w/ no returns--Sam got right back with me-- said that seller is shady and the he had the PS but sold it first----AND he gave me a link to much better deal on a red.
His humor is subtle-- he has a few words to say about Ebay sellers and what they mean when they make claims-- like 'Untested no returns' actually means tested and DOA.. etc LOL.
Check out Sam's Laser Classified-- BUT a few times Sam has sold something but forgot to remove the listing.

I give Sam a break on such things--he also buys if you have something he does not OR if he has never seen --he will want it.
I convinced him to join the forums--IIRC he had not posted when someone posted ... :?Sam ? as in Laser Sam??
he reply was 'yes that Sam'-- Sam has forgotten more laser stuff than most of us know. One exception is Mr Steve Roberts-- who authored some of what we read there and goes out of his way to help forum members-- AND he does not search and post as if he had not searched--many here do that-- posers! When Steve speaks I listen.. Im met him IIRC at 5 SELEMs- he gave me 3 very nice projector housing for the price of just one-- it was time to pack up and most there are not thrilled about carrying unsold gear back home. AND like me!!! Steve is a buckeye!! (Ohio--- round on the ends and HI in the middle--lol)

WE will be waiting for your green HeNs pics!!


here you go!!!

You prolly dont need this but... from eekbay
''This is a Siemens model LGR7641S helium-neon laser tube removed from a supermarket barcode scanner. It is in excellent condition and has been tested, .1mW''
and
Ask a Siemens Technician | A Siemens Tech Answers You Now‎
Adwww.justanswer.com/Siemens‎

GREEN SIEMENS.jpgs-l640  SEIMENS LGR.jpg
 
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paul1598419

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Len, that isn't a green HeNe. I have a Siemens LGK7630S and it is 632.8nm. Siemens doesn't use that G to indicate green.
 

ultimatekaiser

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yep. healthy output for one of those is usually around 3mW of red if the output mirror is clean iirc.
 

paul1598419

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Where have you been hiding, Matt? Glad to see you posting again.
 

hakzaw1

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by Paul----.''Len, that isn't a green HeNe. I have a Siemens LGK7630S and it is 632.8nm. Siemens doesn't use that G to indicate green. '

DUH
every other HeNe w/ G is a green one---what were the thinking??

thanks for the correction---hk
 

ultimatekaiser

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I'm at a pretty strong disconnect with this place now due to my inactivity and alot of the members i was friends with not being around anymore. I'm still around though. I just keep a silent vigil. People know how to get ahold of me if I'm needed.

My expertise is mostly in gas, and few people use or have them or need help with them anymore as they're going extinct on here, in favor of power and solid state, so there's not as much of a place for me anymore.

I still post if I find something interesting. Lately I've been putting more of my efforts into restoring old oscilloscopes.
 

paul1598419

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When you say "old" oscilloscopes, what age do you mean? Old to me is quite ancient, but my 100 MHz scope maybe what you are talking about. I would like to get my hands on a spectrum analyzer from my college days. Well over 40 years ago, but still relevant.
 
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ultimatekaiser

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Yeah about that age, and a bit older on occasion. But that’s a topic for later. I Don’t want to De-rail the thread. :)
 




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