It's hell being dyslexic! I have the tubes wired backwards :( What is amazing is how they lit up and seem to work fine besides the issue of drawing 3 times as much current they should.
Sigh... Off to add lots of cuts and jumpers too my board! -joe On Thu, May 19, 2016 at 5:32 PM, Joe Croft <cro...@gmail.com> wrote: > I do seem to have a problem with my board. I have pulled one of the tubes > and just tried it on a bread board and life is good. Though in the board, > not so good. I will have to dig harder on the layout. Something is just not > right. > > -joe > > On Thu, May 19, 2016 at 2:59 PM, gregebert <gregeb...@hotmail.com> wrote: > >> Best thing to do is gather data for several tubes, and plot it. >> Inconsistent data suggests problems with the tubes; maybe they are used, >> out-of-spec, reject, etc units. >> >> I would use a voltmeter and measure the voltage at the following >> locations, while adjusting Vc to obtain >> (a) First speckle of light on the tube, (b) 25%, (c) 50%, (d) 75%, (e) >> maximum, which might not be 100%. >> >> Measure Vc, Voltage at emitter, voltage at collector, voltage at the AUX >> pin, AND the +120V supply (it may not be constant, due to loading). >> Obviously you would enter this data into a spreadsheet because there are >> calculations that need to be done (tube voltage and current), and it does a >> good job creating plots. >> >> Once you have that info, we can figure out what's going on. >> >> Is the transistor getting warm ? Depending upon the case style it may >> only be capable of 625mW. From the circuit, I can see scenarios where you >> could exceed this if you're running at 160V and above 13mA. >> >> >> -- >> 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/b6cbe906-453b-4e5b-8062-2c80848ba8df%40googlegroups.com >> <https://groups.google.com/d/msgid/neonixie-l/b6cbe906-453b-4e5b-8062-2c80848ba8df%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> >> 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/CAE%2BVk6OhRLRy27_Sf3fEXT5VZJ8hVYSbZoVTXcun1FeDtb2%3D9w%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
