In the last years of serious tube research and design there was a new type of cathode created, which was as efficient as previous types, but was immune to this effect. Most of tubes designed to be used in digital circuits were designed with long times with no anode current flowing. We can't tell the switching tube type in this counter and tell whether it used the improved cathode or not, but 5814A datasheet from Tung-Sol clearly states that this tube "will tolerate long periods of operation under cut-off conditions".
W dniu wtorek, 9 października 2018 15:37:15 UTC+2 użytkownik GastonP napisał: > > Actually, tubes used in binary counters have a problem known as "cathode > poisoning" that is unrelated to the one of the nixie tubes. Apparently a > resistive layer is formed on the cathode when the tube is kept long periods > of time turned on but in "off" state, which renders the tubes useless for > any kind of linear usage afterwards. > So the amount of money to be had from then is actually pennies :) . At > least for the discerning buyers. > > On Monday, October 8, 2018 at 4:54:57 AM UTC-3, Tomasz Kowalczyk wrote: >> >> During my routine search for interesting auctions I found this auction: >> >> https://www.ebay.com/itm/Burroughs-6844A-Nixie-Tubes-on-PCB-Sockets-Leads-w-Counters-6703-5814a/192682396566?epid=1825418631&hash=item2cdcc40b96:g:Pf8AAOSw8U9burg8 >> >> The counter modules seemed suspiciously large, so I thought they might be >> non-semiconductor. And it seems it isn't a triode based digital system - in >> those large metal cylinders there are some unknown tubes. I think they >> might be beam switching tubes, as those required external magnet to work. >> The modules go by name CP-468/U, but I can't find any information about >> them. >> This auction isn't mine and if I hadn't already spent lots of money on >> interesting and unnecessary stuff lately, I would probably buy it out of >> curiosity. >> Also, the double triodes seen there (5814 tubes) might be worth a penny, >> as they seem to be a replacement for 12AU7/ECC82, popular tube in high-end >> amplifiers. >> > -- 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 [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/a4f94db3-2f1d-4a45-908b-4c1d429619f8%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
