Linear supplies can generate switching harmonics as the diodes turn on and off, but the harmonics taper-off pretty quickly so I'm doubtful they have much energy in the RF region (AM radio band starts at 530kHz).
I'd place my bets on the switching-on and off of tube segments, along with the associated wiring. Then the microcontroller. -- 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/9b1ce229-94e6-4a37-b159-9c094d8a0c86%40googlegroups.com.
