Misbehaving NL803

[Nicholas Stock]

Anybody seen a tube do this before? Blue corona around every digit.:.needs a high strike voltage until digit ignites otherwise the pin below the mica disc glows instead....odd. Otherwise the tube looks clear and unused.....

[Jeff Walton]

I had some used NL841 tubes that had not been run in 25 years that glowed below the mica but cleared up after about 24 hours and have been fine since.   Didn't have the bright blue.   Are you running over voltage? 

Jeff

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[Nicholas Stock]

Hi Jeff, yes driving way over voltage just to get the digit illuminated....id ran the tube for 24 hrs before at rated voltage and nothing....duff tube by the looks of it...I've had plenty of NL840's and the like that needed some coaxing back to life, but nothing like this....

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[gregebert]

Blue dots......I've seen them come and go on my Burroughs 6091's. Based on the color, and previous postings in this forum, it's probably spectra from mercury.

Hard to tell from the pictures if it's mercury; mine are a duller color than the picture.

[Jeff Walton]

Are you running high enough voltage that the blue is an actual arc between pins or just a glow? 

[Niek]

You should be happy: now you don't have to install a blue LED underneath it to light it up: you can sell them for a premium on eBay! ;-)

[Nicholas Stock]

Just a glow Jeff. I ran them again overnight at ~175V and the 'legs' under the mica spacer are still all that illuminates....hmm.

On another note, does anyone have any NL807's they're willing to trade?

Nick

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