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Old 04-05-2012, 09:42 PM #17
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Default Re: Trouble firing up my new HeNe tube

Did you put a ballast resistor in series with the
Anode of the Tube like in the Pic in Post #2.....

Jerry


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Old 04-05-2012, 09:45 PM #18
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Default Re: Trouble firing up my new HeNe tube

Well, looks like the tube that I got is dead as well. Just saw a couple of blue sparks in the microwave and no joy when I hooked it up to the PS.

Scared to touch this thing now.
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Old 04-05-2012, 09:56 PM #19
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Default Re: Trouble firing up my new HeNe tube

*ZAP*

lol holy crap! Power supply got me.

Last edited by Ghostchrome; 04-05-2012 at 09:56 PM.
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Old 04-05-2012, 10:20 PM #20
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Default Re: Trouble firing up my new HeNe tube

about the oudin - tesla coil. this is used to just test the gas integrity of a sealed tube? or for something else? i have one - well a plasma globe - which will make an unpowered (by the ps) tube light up without lasing.
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Old 04-05-2012, 10:50 PM #21
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Default Re: Trouble firing up my new HeNe tube

Quote:
Originally Posted by daguin View Post
Thanks for the link. I missed it since we both posted at the same time earlier. If I decide to get more untested tubes I may contact le quack and get one of his boards to test with.


Quote:
Originally Posted by lasersbee View Post
Did you put a ballast resistor in series with the
Anode of the Tube like in the Pic in Post #2.....

Jerry
There's a 77k ballast resistor built into the positive lead going to the mounts I got from Sam. You can barely see it in my avatar pic.

Quote:
Originally Posted by Ghostchrome View Post
*ZAP*

lol holy crap! Power supply got me.
Welcome to the world of gas lasers. One reason all my lasers connect to their PSUs via alden style connectors is so I can disconnect them and short the pins to discharge the built up charge on the tube. That's one way I could tell the PSU was working when trying that tube. I could see and hear the spark when I shorted the pins.
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Old 04-05-2012, 11:13 PM #22
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Default Re: Trouble firing up my new HeNe tube

Quote:
Originally Posted by Ghostchrome View Post
*ZAP*

lol holy crap! Power supply got me.

Now I told you in the other thread about that

It's more of a surprise than pain but it will get your attention


Sorry about your guys tubes
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Old 04-05-2012, 11:42 PM #23
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Default Re: Trouble firing up my new HeNe tube

Did anyone get good tubes from that link? I bought one, and I am afraid that I got a bad one too. -.-
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Old 04-06-2012, 12:04 AM #24
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Default Re: Trouble firing up my new HeNe tube

Quote:
Originally Posted by LtKernelPanic View Post
Welcome to the world of gas lasers. One reason all my lasers connect to their PSUs via alden style connectors is so I can disconnect them and short the pins to discharge the built up charge on the tube. That's one way I could tell the PSU was working when trying that tube. I could see and hear the spark when I shorted the pins.
hmm I'll definately have to look into that.

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Originally Posted by n2stuff View Post
Now I told you in the other thread about that

It's more of a surprise than pain but it will get your attention


Sorry about your guys tubes
Yeah, I guess I didn't leave it sit long enough.

Quote:
Originally Posted by Wolfman29 View Post
Did anyone get good tubes from that link? I bought one, and I am afraid that I got a bad one too. -.-
Yep, that's where I got mine.

Last edited by Ghostchrome; 04-06-2012 at 12:05 AM.
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Old 04-06-2012, 04:14 AM #25
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Default Re: Trouble firing up my new HeNe tube

Quote:
Originally Posted by cheech226 View Post
about the oudin - tesla coil. this is used to just test the gas integrity of a sealed tube? or for something else? i have one - well a plasma globe - which will make an unpowered (by the ps) tube light up without lasing.
The coil will cause the gas in the tube to glow if its still present.
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Old 04-06-2012, 09:27 PM #26
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Default Re: Trouble firing up my new HeNe tube

So I just got mine in the mail and it's really neat. Never had a gas laser before. No PSU yet though. I do have a HV flyback run on a ZVS though.

The question is, how can I check if my tube has degassed? I turned my flyback on and drew an arc and put the tube within 3-4 inches of the arc (so it wouldn't arc to the tube itself) and I didn't get any glow. Does that mean that it is dead? :\

Also - does it matter what the current/frequency/voltage is of the HV HF source that I put the tube near?

EDIT: Alright, so I read on Sam's Laser FAQ that I would be able to test it out by hooking it up even to an HV AC source (like my flyback transformer) if I put enough resistance to limit current. I think I may have killed my tube though, because when I was measuring current, I didn't realize I was measuring DC current until I had already tested it. Under that same test layout that I tested the tube with, I was measuring 70mA D: I don't know what happens when you overcurrent a HeNe tube, but I assume it dies =p I saw no plasma or anything. I eventually reduced the current to about 7-10mA (a BUNCH more resistors), I tried it again, but no plasma or nothing

Should I still try to stick it in a microwave?

Last edited by Wolfman29; 04-06-2012 at 11:08 PM.
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Old 04-06-2012, 11:33 PM #27
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Default Re: Trouble firing up my new HeNe tube

I'd try the micro. I only let it go 5 seconds. I'd be shocked if yours worked. I feel bad for posting that link now but it's a known risk when buying untested, used gas lasers.
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Old 04-07-2012, 01:09 AM #28
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Default Re: Trouble firing up my new HeNe tube

^^ meh, don't feel bad. It was worth a shot, and would have been hella cool if they worked.

There's always next time.
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Old 04-07-2012, 01:35 AM #29
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Default Re: Trouble firing up my new HeNe tube

I don't think 70mA for a short time with no observable glow would have destroyed your HeNe tube, they're pretty robust in that regard. That being said you should have seen a glow with even a few picoamps of high frequency HV near the tube.. it is probably dead and not by your fault.

This is looking more and more like some one unloaded a bunch of dead tubes on eBay!
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Old 04-07-2012, 03:07 AM #30
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Default Re: Trouble firing up my new HeNe tube

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Originally Posted by Sigurthr View Post
This is looking more and more like some one unloaded a bunch of dead tubes on eBay!
Yeah...

Anyone leave him feedback yet?

I think he mentioned that he wasn't sure if they worked or not (which is complete BS, but whatevs)
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Old 04-07-2012, 04:16 AM #31
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Default Re: Trouble firing up my new HeNe tube

Yeah, I made the mistake of purchasing another -.-
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Old 04-08-2012, 02:11 AM #32
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Default Re: Trouble firing up my new HeNe tube

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Yeah...

Anyone leave him feedback yet?

I think he mentioned that he wasn't sure if they worked or not (which is complete BS, but whatevs)
I did. I left positive because I couldn't in good faith leave negative for something that was advertised as as-is untested. I did note the tube was EOL aka dead. Oh well I'm going to keep it around to use as a demo tube so don't have to keep handling one of my good tubes to show people.

On a related note I got my PSU in the mail today. I'm going to try it with the little 6" tube that I got from Sam. I may have to take wannaburn up on his offer if the tubes he has are similar to the dead one for visible plasma.
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