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Old 03-01-2015, 02:57 AM #17
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Default Re: HeNe questions

They typically last 5-10 thousand hours depending on size and treatment. Most modern tubes are hard sealed, so they don't wake on any timescale that matters, nor do they have to be run periodically like argons, as the tube is glass not ceramic. A hene tubes life is typically up once the oxide on the cathode is used up, which exposes it to the discharge and causes it to sputter bits of it off creating metallic deposits on the mirrors and around the cathode and causing the gas pressure to drop.

The ballast will usually get hot and the tube usually will get a little warm as you run them and that's normal. While it's running or after it's been run recently don't touch the anode as it will be live.



Last edited by ultimatekaiser; 03-01-2015 at 02:58 AM.
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Old 03-01-2015, 05:04 AM #18
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Default Re: HeNe questions

I've had a few EOL (end of life) LHR-05-911 MG 632nm HeNes "die" of old age on me because I ran them 24/7 for years as accent lights. Basically they gradually suck in air (almost not worth mentioning on hard seal tubes) and diffuse out (lose to the atmosphere) Helium. When this happens the starting voltage rises and the power supply is no longer able to ignite the tube reliably, but can run the lit tube still well as long as the tube's rated current was in the lower end or middle of the power supply's output current range. I have a bare tube on my bench that does this... takes more than 15kV to ignite, but only runs 0.7mA hot above rating.
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Old 03-01-2015, 05:55 AM #19
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Default Re: HeNe questions

well...the gas doesn't leave the tube generally...it just gets buried under the sputtering and in the aluminum of the cathode usually. you can tell as it starts weeping from the holes in the front of the cathode, creating silver spots and the output drops. I have a couple end of life greens and they still light pretty well. they're just really weak from age unless you up the current some. every EOL tube kinda acts different. but generally 'tis as you say. the voltage climbs too much and the current drops until the tube drops out and cant stay stable. like an old neon sign kinda.
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325nm: Omni 2056-M-A01 HeCd
375nm: Melles Griot RCS-007

405nm: Melles Griot RCS
430nm: Coherent D3 430-10
441.6nm: Omnichrome 2056-M-A01/4074-P-A03 HeCd laser
457.9nm: Argon Ion Line

472nm Omni-643RYB Whitelight Line
473nm: CNI MGL-473-100, CNI GLP-473
476.5nm: Argon Ion Line

483nm Omni-643RYB Whitelight Line
488nm: Argon Ion Line, Spectra Physics >20mW Cyan DECSL Laser, Coherent Sapphire 488-20 OPSL

496.5nm: Argon Ion Line
501.7: Argon Ion Line
514.5nm: Argon Ion Line
520nm: Trustfire A8 Custom

532nm: CNI MGL-F-3W, Coherent Genesis MX Taipan OPSL, LG Hercules-325
543.5nm: 05-LGR-193 Melles Griot HeNe 3.8mW
Melles Griot LGB-563 HeNe

561nm: Melles Griot 85-YCA-015, Coherent Sapphire 561-20
568nm: Omni-643RYB Whitelight Line

577nm: Coherent Genesis MX Taipan OPSL
583.8nm: DPSS line
586.2nm: DPSS line
588.6nm: CNI PGL-M-80

591nm: DPSS line
593.5nm CNI MGL-H-50 Lab Laser
594.1nm: Coherent 31-2230-000 (4.5mW)

604.6nm: LOR-150 HeNe line
609nm: Raman HeNe line?
611.8nm: Melles Griot LOR-150 HeNe (5mW), LOR-006 HeNe (0.5mW)

632.8nm: Spectra Physics Model-127 (>35mW), Model-124B, Model-120, Model-117, others
Melles Griot LHB-580, LHB-190, WHR-570

641nm: Melles Griot RCS
647nm: Omni-643RYB Whitelight Line
659.6nm: Laser Quantum IGNIS DPSS laser 0.5W

671nm: CNI PGL-III-C-100
676nm: Omni-643RYB Whitelight Line
690nm: custom diode laser
694nm: Portable Q-switched Ruby Laser

1152.6nm: SP-120 HeNe alt. mirrors
1523.5nm: Melles Griot LIR-151 HeNe
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Old 03-01-2015, 08:53 PM #20
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Default Re: HeNe questions

If my understanding is correct, its when the voltage gets to a borderline amount to keep the tube running and the tube starts to sputter or spark and do other weird things that significantly drops the life on the HeNe.

I had a 24/7 12" that ran without issue for over 3 years without any issue. That's over 26,000 hours.

Found it one morning sputtering and flickering on and off. I thought maybe the driver died.

I asked Sam and he said it was probably EOL on the tube, just because of time run and that the drivers usually don't go out like that. YMMV.

3-4 hours + on battery would be fun though
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Old 03-01-2015, 09:00 PM #21
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Default Re: HeNe questions

Yep that sounds like an EOL tube. Yes typically the larger diameter tubes are rated 10000 hours, but that doesn't mean that they can't outlast that. Just like diodes it has to do with the treatment. If you turn it on and simply leave it running it will generally run longer than if you're starting and stopping it all the time. Another part of it has to do with whether it's hard seal vs. soft seal, as well as the type of getter and cathode used. I've seen that zirconium and iodine stabilized cathode ones that are rated for over 100,000 hours!

Also Reds have a tendency to last longer than the other colors, as to get the other colors and higher powers that usually fill them at a lower pressure and a little more neon heavy I believe to help with those transitions, which is why they're more pink and appearance. IR tubes are the opposite and show up a bit more golden yellow orange colored like a HeCd to facilitate the longer IR transitions.

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