Re: [neonixie-l] 7971 nixie tube problem

That vintage clock is interesting indeed. Built from a 1976 article in 73 magazine. You can read part of the article. The author discusses the voltage rating of the transistors, notes that he has no data ... and "inquiries among friends and on the nets failed" On the nets? Was that

Re: [neonixie-l] 7971 nixie tube problem

The same seller has an empty school display board for sale that takes 15 of those tubes, so he picked up two of them? There is also this clock with six tubes in it that I am surprised is still for sale: https://www.ebay.com/itm/122680353656 (Sorry, don't mean to hijack this thread) -- You

Re: [neonixie-l] 7971 nixie tube problem

Speaking of B7971 tubes... http://www.ebay.com/itm/good-burroughs-b-7971-nixie-tubes-qty-available-/232480774966 I have a hunch I know where these came from and how much was paid for them too.but that's irrelevant. 30 tubes for sale though! Not my auction etc etc... Cheers, Nick On Thu,

RE: [neonixie-l] 7971 nixie tube problem

Wow, that's really odd - and really bad luck. My original B7971 tubes survived 40 years in moving boxes from home to home with no real special protection and have worked well after being put into a clock about 3 years ago. I can't understand what would cause the glass to do this in a regular

Re: [neonixie-l] 7971 nixie tube problem

I was thinking thermal-cycling; if they were stored in a garage or attic for 30 years where temperature is unregulated, it could cause a lot of thermal cycles. Imagine if there was something like a clothes-dryer, furnace, or water-heater nearby; they would cause a lot of thermal cycles over 30

Re: [neonixie-l] 7971 nixie tube problem

The glass needs to have high tension in it to break like that. This is interesting, I've broken few tubes in my life and they all crack like standard glass (big pieces and small amount of small shards). Combining this with fact that the breaking ones had no marking leads me to a crazy idea -

Re: [neonixie-l] 7971 nixie tube problem

Yes one like a car window only with no glue. The other 2 developed hairline cracks when picked up. Ira will check further when I get back home. May be knock offs but who would have made them? Clarke Sent from Verizon Note 2 On Sep 7, 2017 2:52 PM, "Tomasz Kowalczyk"

Re: [neonixie-l] 7971 nixie tube problem

What do you mean by "disintegrated"? Did it break into thousands of pieces, like a car window? W dniu czwartek, 7 września 2017 19:32:45 UTC+2 użytkownik Clarke Payne napisał: > > as far as I can tell temperature changes were not "radical". packed in > solid thick plastic case with no stress.

Re: [neonixie-l] 7971 nixie tube problem

as far as I can tell temperature changes were not "radical". packed in solid thick plastic case with no stress. tube pins look straight. will check with magnifying glass. ones that broke when I picked them up developed hairline cracks immediately. one just disengrated. when I get home will post

Re: [neonixie-l] 7971 nixie tube problem

I had none in storage, and the ones I purchased in the past year had no signs of stress. Is it possible yours were damaged in storage ? I've never seen glass weaken on it's own. Also, the pins are fairly rigid (unlike IN-18's which are quite soft) so if there are any bent ones, it suggests the

Re: [neonixie-l] 7971 nixie tube problem

Fractured when you picked them up? Odd. Have they been exposed to long periods of temperature swings in storage? That might make them susceptible. Nothing special with regard testing them. Easy check for gas is to hold them next to a plasma globebe careful if you need to bend the pins, be