And use a 50/50 divider, to make the voltage between anode and cathode of the tube as low as possible. Do not set it at 120V, but go for 90V, using equal resistors. If your HV is higher than 180V, try reducing that to at least 180V or perhaps 170V.
Op vr 19 jan. 2018 om 18:52 schreef Frank Bemelman < [email protected]> > Well, the voltage divider is at half of 180V, more or less 90V. Even is > some current was leaking through your anode transistor, the voltage between > tube anode and tube cathode, is still to low to cause any glow. The tube’s > digit will only glow with a fully turned on anode transitor and cathode > transistor. Give the diode patch a try and enjoy the result... > > Op vr 19 jan. 2018 om 18:04 schreef Tomasz Kowalczyk <[email protected]> > >> >> >> W dniu czwartek, 18 stycznia 2018 19:29:02 UTC+1 użytkownik Frank >> Bemelman napisał: >>> >>> It is not the transistor that keeps conducting or leaking. The voltage >>> you see at the anode comes from leakage from floating cathodes from the >>> other tubes. >>> >> >> >> Oh it was just seconds ago when I understood what did you mean by the >> floating anode voltage. Right, that should happen, if one of cathodes is >> grounded, then literally any leakage current will cause 130Vish voltage on >> the anode to appear. However, this would mean that MMBTA92 have some >> serious leakage current issues if at Uce = 60V it leaks enough to cause >> visible glow. >> However, that still makes me wonder why do they leak only when other tube >> is conducting. There is a cathode grounded at all times and there is no >> voltage drop across the tube when no tube is conducting (probe internal >> resistance causes the voltage to be not floating, that's why on the graphs >> it looks like it's about 0V during dead time). >> >> -- >> 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 email to [email protected]. >> To view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/951afbbd-ff69-4fa9-8ca9-2106ee3b5bbb%40googlegroups.com >> <https://groups.google.com/d/msgid/neonixie-l/951afbbd-ff69-4fa9-8ca9-2106ee3b5bbb%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> > -- > Vriendelijke groeten, > Frank Bemelman > > Frank Techniek > Vennestraat 11X > 2161LE Lisse > Telefoon +31 252 425 772 > -- Vriendelijke groeten, Frank Bemelman Frank Techniek Vennestraat 11X 2161LE Lisse Telefoon +31 252 425 772 -- 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/CAEhU53-UVeq8%2B8UiVwqee_WvuyhfqRe%2B-LDTVtezPPdHiG-Jbg%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
