Since I'm picky & stubborn, I do my own designs. That way I can only blame myself. Snarkiness aside, making a production-worthy design is not trivial and I'm sure that the few kits that are available are designed by engineers who have day-jobs as well. On top of that, kits need to be affordable, so that means the design will have tradeoffs. Lastly, many kits might not include 100% of the parts (again, for cost reasons), so substitutions are inevitable. All of these things combined will result in no 2 boards being 100% identical, and that's an opportunity for things not to work as expected. ========================================================= Fuzzy blue spots are a tube issue; spectra suggest it's mercury. But you definitely want tubes that contain mercury because they have a longer lifetime. I have yet to find any information that explains the low-level details why this is the case, such as chemical-reaction equations, etc. I've been watching a blue dot in one of my tubes for more than a year, and it has not changed in size, location, or brightness. I suspect there is an impurity on the cathode that attracts mercury.
Singing doesn't exist with direct-drive, but I suspect most designers avoid direct-drive for cost reasons. Overheating can be caused by many factors, such as the case, and may have nothing at all to do with the circuit design. -- 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/b1586478-9481-450c-b78b-fb073525ba75%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
