UPDATE 2: Both boards are complete, everything connected together. I was unable to get a visible trace on the CRT. Voltages seem correct, but for some reason the fuse protecting the filament blew out. Filament did not blow as confirmed by continuity. I need to investigate further, and will need to get some slow-blo fuses before I power-up again. The fuses that came in the kit were unmarked, so I have no idea what it was, or it's characteristics. Only info is what is printed in the docs. The CRT datasheet says 150mA at 6.3 Vrms (same as DC).
I will be measuring filament I-V characteristics tomorrow, then decide what fuse is best. Powering-up the CRT without a fuse (eg, shorting it out or using a larger value) is NOT going to happen. I might have to wait to power-on again after I get some replacements thru DigiKey. On Saturday, May 22, 2021 at 10:44:18 AM UTC-7 Paolo Cravero wrote: > Hello. > My boards take about 10W input, that is ~800mA at 13V. Without a CRT > connected the current drops to ~470mA. > > A word of caution to current builders. Q6, Q9, Q12 and Q15 (all MPSA44) on > the PSU board get pretty hot. I measure 60°C on the top of their plastic > case! Even without a CRT connected. Please do check yours if they heat up > like mine! Possible solutions besides a small heatsink?! > > Paolo > -- 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 view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/44e62082-fc33-464b-a307-c5980fd43919n%40googlegroups.com.
