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 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/CAOQ6x0FqWNTuYsDaPQ3p36A%3DXzGabbYJmQen4aSLBX%2Bueq08Pg%40mail.gmail.com.
