B5750 Nixie tubes for sale in a week or two...

[Craig Smith]

OK, I saw an auction on eBay for B5870 Nixie tubes. By the time I got home and went to buy them, the auction was finished, but the same seller had another auction going.

The pictures looked similar, and I assumed they were another load of B5870.....I bought 20 and them and a couple days later (after the seller had posted them, from America), I re-read the details and found out they were actually B5750 tubes. The seller said that I can send them back for a refund, but due to me living in the UK and the obvious postage cost, I thought it may be easier to sell them on here.

So, if anyone is interested in some used B5750 tubes, I will have 20 of them in a week or so. I will obviously test each one to make sure they work.


If anyone is interested in all of them, or just some of them, please PM me.


Thanks

Craig

[JohnK]

PayPal oftens pays for returns. But it might give a black mark.

 

John K

 

--
You received this message because you are subscribed to the Google Groups "neonixie-l" group.
To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+...@googlegroups.com.
To post to this group, send email to neoni...@googlegroups.com.
To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/48f2413e-3679-425e-8c6f-8916bff8c551%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[Terry S]

My first home brew clock was B5750s. Nice smaller tube. I built a 4 digit clock into a Zenith "Circle of Sound" clock radio, in which the mechanical clock had failed.

I believe it to be the very first published example of a nixie tube clock radio. The picture was featured on the home page of neonixie-L back in the Yahoo era, for quite a while. Some long-timers here may remember that. 

The B5750s seem to be rugged little tubes with plenty of life and good brightness. If I had any small clock ideas in the works I might buy them from you.

Terry

[Craig Smith]

I quite like the B5750 tubes, but don't actually need them. I wanted the B5870s as I wanted spares for my Nixie watch I made. The B5750 tubes are 5mm taller and won't fit.

If you haven't seen the watch on here, here's a picture...

[Paolo Cravero]

Craig,
I think 5750 and 5870 share the very same pinout, both physically and electrically, right?

I have some NL5870/ZM1332 and their non-standard pin spacing "forced" me to get into the whole PCB design and production process (with KiCad). It turns out that I got more PCBs than Nixies (there was no saving in ordering 3, 5 or 10 pcs!), so when they will show up in my mailbox (and be tested), I will have few spare basic PCBs that I would have offered on the list nevertheless. No problems to share design files for non-commercial use.

They are 4-digit multiplexed, 74141 onboard and there is support for both decimal points controlled through NPN darlington. Anode mux'ing is off-board because everyone uses a different method, even myself. It is a very basic design, but I wanted something to hold the tubes not the whole circuit, even though I agree that a PCB is convenient if you're going to build more samples of the same design.
The rendering looks like this: https://2.bp.blogspot.com/-Wz75hnLVWvw/WN7RYpV9UyI/AAAAAAAABrI/gUdROEZd2QMsUVcQA9zgEZnGwLmCKAZ1QCLcB/s1600/4xZM1332-01.png

So, someone might get to build a 4x 5750 display sometime in the future. My PCBs have been on the road already for 45 days... stay tuned.

Paolo

[threeneurons]

If you believe the datasheets, the 5750 glass tube is ~0.15" (~4mm) taller. If it wasn't for an existing watch, they are "almost" the same tube. But since it is being crammed into a tiny space, that 0.15" will probably make a big difference.

http://www.tube-tester.com/sites/nixie/data/b5750s.htm

http://www.tube-tester.com/sites/nixie/data/b-5870st.htm

Only way, to really tell, is to get them "in hand", and see if it will fit. If not, I guess we'll see some tubes for sale.

[Craig Smith]

They are a very similar size, but with only 46mm internal diameter in my watch, 4mm is quite a lot.