Is that definitely the case for the IN18 though? It might be a different voltage for them perhaps?
David On Tue, 19 May 2020 at 16:39, Richard Scales <[email protected]> wrote: > I could understand that but having built several of PV's spectrums I know > that the HV power supply is set to 170v during construction. > > > On Tue, 19 May 2020, 14:03 David Pye, <[email protected]> wrote: > >> I thought the ignition voltage is a *minimum*, so people are probably >> running with a higher voltage and thus a higher series resistor to limit >> the current? >> >> David >> >> On Tue, 19 May 2020 at 11:48, Richard Scales <[email protected]> >> wrote: >> >>> Very sorry for asking such a fundamental question. >>> >>> I thought I had this all sorted but I'm having a problem in correlating >>> my understanding with what I see others doing. >>> >>> When checking specifications for IN-18's over at Tube-tester.com - he >>> suggests: >>> >>> Ignition Voltage 170V >>> Voltage drop 150V >>> Nominal current 6mA >>> >>> So I deduce, with a 170V HV supply, the series resistor should be (for >>> nominal current) (170-150)/0.006 = 3K3 >>> >>> Similarly for something like ZM1040, supply volts 170V, maintaining >>> volts 140V, nominal current 4.5mA, series resistor (170-140)/0.0045 = 6K6 >>> >>> I note that in kits such as PV Spectrum and others - for this kind of >>> tube they specify 10K series resistors. >>> >>> Am I mis-interpreting the specifications, in particular those for the >>> IN-18 as the voltage references are worded slightly differently? >>> >>> Are the tubes in question being driven at a lower current on purpose? >>> >>> I'm ready to learn! >>> >>> Richard >>> >>> >>> >>> >>> >>> >>> -- >>> 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 view this discussion on the web, visit >>> https://groups.google.com/d/msgid/neonixie-l/79cf25b3-0c41-4d1c-9255-97530f31e26a%40googlegroups.com >>> <https://groups.google.com/d/msgid/neonixie-l/79cf25b3-0c41-4d1c-9255-97530f31e26a%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- >> 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/t4TkKJKvElQ/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> [email protected]. >> To view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/CAOQ6x0FqWNTuYsDaPQ3p36A%3DXzGabbYJmQen4aSLBX%2Bueq08Pg%40mail.gmail.com >> <https://groups.google.com/d/msgid/neonixie-l/CAOQ6x0FqWNTuYsDaPQ3p36A%3DXzGabbYJmQen4aSLBX%2Bueq08Pg%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> > -- > 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 view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/CA%2B9r3s_4iB1xh7ncHGKqnc8L32O%2BuVHQPE_zGevMRPvu53%2B-jA%40mail.gmail.com > <https://groups.google.com/d/msgid/neonixie-l/CA%2B9r3s_4iB1xh7ncHGKqnc8L32O%2BuVHQPE_zGevMRPvu53%2B-jA%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- 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 view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/CAOQ6x0E3F3tAGK0PiWNG9sC3ViVrwPx71ZcwMVP78Eb68aDBuw%40mail.gmail.com.
