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Old 05-22-2013, 06:21 AM #17
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Default Re: HeNe Power Supply issue

I doubt the tube is damaged if you're seeing any laser beam come out at all. It is still very possible it needs more ballast resistance. I don't know why it would suddenly need more ballasting when removed from the housing unless it used two resistors and you only found one. That would make the most sense as I said earlier 35k is VERY low. 68k is typical and two 35k's in series would probably work fine. This PSU seems to supply 4.0-5.5mA which should be perfect for most of these tubes. I'd set the pot to the middle of the range.

If you can run to a radioshack or equivalent and grab a 68kohm resistor. The more wattage the better but I've used 1/4W before. Try it instead of the ballast resistor you are using, it might just solve all the issues.


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Old 05-22-2013, 06:26 AM #18
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Default Re: HeNe Power Supply issue

Just double checked and there is nothing else In the end piece. It will have to be thursday when I can get to radio shack. Going too high wont cause any damage will it? Should I buy an areay of resistors and just slowing increase resistance untill it works or jump right tp the 68k?
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Old 05-22-2013, 07:31 AM #19
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Default Re: HeNe Power Supply issue

Too high wont cause any damage at all. Grab a 68k and a bunch of 10ks, then you can try in 10k increments if you like. My money is on 68k though.. I've ballasted over 10 tubes of varying sizes with 68k.
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Old 05-22-2013, 08:52 AM #20
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Default Re: HeNe Power Supply issue

Bear in mind the capacitive properties of the metal enclosure and its effect on the discharge down the bore.
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Old 05-22-2013, 12:51 PM #21
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Default Re: HeNe Power Supply issue

Quote:
Originally Posted by Speedy78 View Post
Just double checked and there is nothing else In the end piece. It will have to be thursday when I can get to radio shack. Going too high wont cause any damage will it? Should I buy an areay of resistors and just slowing increase resistance untill it works or jump right tp the 68k?
Just being thorough here --
You are already getting very good help

In the endcap, it there any rubbery or plastic looking substance?
Often times resistors are "buried" in material in the cap

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Last edited by daguin; 05-22-2013 at 12:52 PM.
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Old 05-22-2013, 04:20 PM #22
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Default Re: HeNe Power Supply issue

When I pulled the wire out I could see where it was connected to the inpyt from the outside then followed it to the back of the tube. Thats when I cut the resistor out to facilitate taking that tube out. So its just this 1 resistor. I even double checked. Only thinh left is what apears to be something reflective inside a black llastic tube that was inline with the back mirror. It has two wires coming out of it. They were never hooked to anything before. I think it was something to monitor ouput.
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Old 05-22-2013, 05:24 PM #23
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Default Re: HeNe Power Supply issue

Quote:
Originally Posted by phenol View Post
Bear in mind the capacitive properties of the metal enclosure and its effect on the discharge down the bore.

Just saw this. Should I be adding a capcitor of some sort then?
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Old 05-22-2013, 05:32 PM #24
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Default Re: HeNe Power Supply issue

No, try with bigger ballast or put the tube back inside.
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Old 05-23-2013, 05:12 PM #25
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Default Re: HeNe Power Supply issue

Success!! Well sort of. Radio Shack didnt have anything close to what I needed. All their high wattage resistors were a mere 10 ohms. All they had was 1/2 watt in anything I could use. Did some quick math and have 5 470kOhm and 1 220kOhm resistors in parallel giving me 65k measure on the DMM. Am I correct in thinking all these half watts in parallel give me a 3W resistor? Any way tube fired up like it should. No more buzzing and a nice stead glow!

Thank you all who helped!
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Old 05-23-2013, 07:09 PM #26
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Default Re: HeNe Power Supply issue

Yup all the power ratings add up, but the lower resistance resistor will carry slightly more power than the higher res ones - not an issue though. A single half watt 68k can handle it but it would run hot. It will run fine as you have it.

Glad to have helped!
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