[neonixie-l] Re: 9-segment nixie posted on Ebay

Hopefully i will get this one :) Am Mittwoch, 22. April 2020 18:50:11 UTC+2 schrieb gregebert: > > Not my item / no affiliation: > https://www.ebay.com/itm/EXPERIMENTAL-NIXIE-TUBE-DEVELOPMENT-SAMPLE-PANDICON-RARE-UNIQUE-9-segment/223985955147?hash=item34269a714b:g:RKwAAOSwKk5eoG8n > > > > 9-se

RE: [neonixie-l] Nice purchase for anyone interested in unusual single digit vfd tunes

It didn’t sell for 99eu + shipping. So, he relisted it for 156eu + shipping. What am I missing? Michail Wilson 206-920-6312 From: neonixie-l@googlegroups.com On Behalf Of David Eustace Sent: Friday, April 17, 2020 8:10 AM To: neonixie-l@googlegroups.com Subject: [neonixie-l] Nice purchase for

Re: [neonixie-l] Nice purchase for anyone interested in unusual single digit vfd tunes

That’s very weird! He must think if he gives the illusion of value it’ll be worth it. I’ve been watching out for things like this for ages and out of nowhere there are actually another 2 opportunities to buy calculators with these types of very unusual vfd tubes: https://www.ebay.co.uk/itm/114134

Re: [neonixie-l] Nice purchase for anyone interested in unusual single digit vfd tunes

Out of interest http://vintagecalculators.com/html/calculator_displays.html#VFD explains the origin of these tubes with unusually shaped digits: "In June 1967 the journal "Electronics" reported that Japanese calculator manufacturers were battling the high royalties that Burroughs Corporation wa

[neonixie-l] Re: updated lab/workshop pic

Nice Telechron! On Monday, April 20, 2020 at 6:37:05 PM UTC-4, martin martin wrote: > > When one or all is stuck at home for en extended time, all you can do it > add new and old instruments to the shelf! > > New setup includes: > Heathkit 2.5 digit DMM > Lambda dual PS > Tektronix 2235 with buil

[neonixie-l] Re: 9-segment nixie posted on Ebay

Not if I have my way! j/k. Not bidding. I watched the CD27 auction, which was UK only. Would probably have gone for even more if it were international. On Thursday, April 23, 2020 at 7:26:31 AM UTC-4, SWISSNIXIE - Jonathan F. wrote: > > Hopefully i will get this one :) > > > Am Mittwoch, 22.

Re: [neonixie-l] Re: updated lab/workshop pic

I have 3 Telechron’s. 2 are 35years old and one is from the early 40s. All of them keep exceptional time. On Thu, Apr 23, 2020 at 14:14 celzey11 wrote: > Nice Telechron! > > On Monday, April 20, 2020 at 6:37:05 PM UTC-4, martin martin wrote: >> >> When one or all is stuck at home for en extend

Re: [neonixie-l] Re: updated lab/workshop pic

Look on the back or open it. The manufacture date is often inside Usually 1970s or so On Thu, Apr 23, 2020 at 14:21 celzey11 wrote: > I've got this one I got at a flea market years ago...no idea how old it is > but it works and looks great! > > On Thursday, April 23, 2020 at 5:17:56 PM UTC-4, m

Re: Re: [neonixie-l] MPSA42 or MJE340?

So this is a matter of academic curiosity and not an effort to make your device work. I think this is a neat thing to do. Based on your observations, this suggests some experiments. In a previous post, I speculated that both part numbers might use the same chip. I now think this is les

Re: Re: [neonixie-l] MPSA42 or MJE340?

I'm absolutely certain the MJE die is physically larger. For one thing, it must conduct more thermal energy to the case. Another tip-off is the difference in DC current-gain, and that in-turn accounts for part of the 1000x difference in leakage current. I believe leakage current is directly prop

Re: Re: [neonixie-l] MPSA42 or MJE340?

Central Semiconductor Corp list them as having the same die size, check their documents named "Device datasheet" here https://my.centralsemi.com/product/partpage2.php?part=CP310-MPSA42 and here https://my.centralsemi.com/product/partpage2.php?part=CP310-MJE340, now I don't know if other manufac

Re: Re: [neonixie-l] MPSA42 or MJE340?

On Thursday, April 23, 2020 at 3:10:36 PM UTC-7, gregebert wrote: > I'm absolutely certain the MJE die is physically larger. For one thing, it must conduct more thermal energy to the case. I am inclined to agree, but if it were me, I would be willing to invest $1.08 and a half hour in the expe

Re: Re: [neonixie-l] MPSA42 or MJE340?

The data differs though I just read that, missed it at the first look. /Martin On Friday, 24 April 2020 00:32:28 UTC+2, Dekatron42 wrote: > > Central Semiconductor Corp list them as having the same die size, check > their documents named "Device datasheet" here > https://my.centralsemi

Re: Re: [neonixie-l] MPSA42 or MJE340?

Much of the additional leakage current is caused by the higher DC gain of the MJE device; the datasheet says gain peaks around 240. Basically, the reverse-leakage current from the collector-base junction gets amplified by the DC gain (beta), to produce the overall leakage (Icbo) -- You receive

Re: Re: [neonixie-l] MPSA42 or MJE340?

Is there a 1000X difference in the gain? Across all lots and all operating conditions, I would have expected less than 10X. On Thursday, April 23, 2020 at 3:56:44 PM UTC-7, gregebert wrote: > > Much of the additional leakage current is caused by the higher DC gain of > the MJE device; the datas

Re: [neonixie-l] Re: updated lab/workshop pic

Did a little research cause I was curious and turns out it's from the 40s On Thu, Apr 23, 2020, 5:25 PM martin martin wrote: > > Look on the back or open it. The manufacture date is often inside > Usually 1970s or so > > On Thu, Apr 23, 2020 at 14:21 celzey11 wrote: > >> I've got this one I go

[neonixie-l] Odd VFD tubes?

Not my sale, but interesting... https://www.ebay.com/itm/25x-IV-18-18-VFD-TUBES-USSR-RUSSIAN-CLOCK-WATCH/223870481065?hash=item341fb872a9:g:GrwAAOSwY8td7osL -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop

RE: [neonixie-l] Odd VFD tubes?

Just a reminder, they are used. But, 25 tubes is a great deal at that price. My purchase was done days ago. 😊 Also, ukrainian_gifts is a great seller. Michail Wilson 206-920-6312 From: neonixie-l@googlegroups.com On Behalf Of