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 <[email protected]> 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 [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/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 [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/CAE%2BVk6Nxtnx5Parg1p3j1xVss%3DMABBpgOVkEyN9iLTHXWNxCAA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
