![]() I’d guess this is an 8 ohm output transformer with an about 80 ohm secondary from the voltage you are seeing. Yes your likely problem is the transformer turns ratio. I did some Googling and it said the only way to work out unknown transformers is test and measure. The only transformers I could find were in old transistor radios, so is the transformer wrong? Sorry to not offer much help with the circuit. I also have a list of many other small ones on eBay here they make many other models including variable and higher amperage versions. It is also transformer based so more efficient than the ones above. For $9.99 it is hard to make it cheaper and impossible to make it smaller. You can find other ones in the files section of Neonixe group !forum/neonixie-l ![]() Here is a simple one with production files and schematic. I have done a lot of work with Nixie tubes and VFD displays that require high voltages and the simplest HV power supplies are usually inductor-based boot converters. ![]() It looks like it makes a half wave input which could be why the output is so low. I must say I don’t really understand how that circuit works.
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