I just measured the filament resistance of a IV-11 tube, according to my multimeter that is roughly 5-5,5 ohm (assuming it measures perfectly at such a low resistance). But I calculated something different;
I'm going to wire the filaments of two tubes in series and feed them 5 volt though a resistor. So I used the voltage/resistor divider formula. to calculate the resistor needed for a 2 volt drop (tubes want 2*1,5V) and that is 10 ohms, going back to the voltage divider that gives ma a resistance of 15 ohms for both tubes and 7,5 ohms for each filament. Close you might say but still a 50% difference. Options: -my multimeter sucks -filament resistance differs because it is cold -both options -my calculations are wrong Well while I wait for an answer I'm going to build a little jig with lego so my tubes will be aligned perfectly straight :) -- 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/4e980192-1b38-42f2-b092-9e62298f2ea3%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
