Sounds like you are going to wreck something! I have a complete (16) tube text-scanning array built with B-7971 tubes. It's direct drive.
-----Original Message----- From: "David Pye" <davidm...@gmail.com> Sent 1/22/2019 3:44:40 AM To: neonixie-l@googlegroups.com Subject: Re: [neonixie-l] Re: Pulsed operation and anode current That makes sense to me. I have been testing, as I say, with continuous current purely to get the anode resistor value set Even with the full 170VDC across the tube, the current is around 8mA. I might decide this is acceptable enough from a brightness I want, but it leaves no room for anode resistor.... It is interesting to me, as most of the calculations rely on the tube pulling the voltage down to Vsustain once it strikes but it seems here that that doesn't happen when passing these kinds of current. David On Tue, 22 Jan 2019, 11:38 Paul Andrews <judge2...@gmail.com wrote: I should add that using a higher voltage also reduces the time it takes for a tube to light up,, which is probably why the datasheet recommends it. > On Jan 22, 2019, at 6:34 AM, Paul Andrews <p...@nixies.us> wrote: > > What is your pulse width and period? The brightness will be greatly affected > by the on time of the pulse as it takes a while for the tube to turn on, > meaning it isn’t on for the whole of the pulse on-time. > > You can decrease how long it takes the tube to light up by holding the unlit > cathodes at between 70V and 100V. > > Like Bill said, you need to use an oscilloscope to see what is actually > happening to anode and cathode voltages. A multimeter is just going to give > you averages. > > -- > You received this message because you are subscribed to a topic in the > Google Groups "neonixie-l" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/neonixie-l/2idq-HQuKMs/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > neonixie-l+unsubscr...@googlegroups.com. > To post to this group, send an email to neonixie-l@googlegroups.com. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/877447b2-0ae8-4a0d-82e6-de75d0d299ea%40googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- 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+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/3A457756-DC1B-4DD7-AA66-39238516C6B0%40gmail.com. For more options, visit https://groups.google.com/d/optout. -- 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+unsubscr...@googlegroups.com. To post to this group, send email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/CAOQ6x0HQqoMQgwXS5WaKgip3hkppKmCNm5Zg66ahTdkhPdem1A%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout. -- 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+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/201901221118787.SM217702%40%5B66.242.162.246%5D. For more options, visit https://groups.google.com/d/optout.
