Single Decatron Clock Issue

Just FYI - Dieter has a schematic on his web site for the simplest A101 Spinner I've seen so far.

www.tube-tester.com/sites/nixie/datdekat/A101/A101.htm

I was confused at first by how the power input is drawn and thought it needed two supply voltages. But I think the idea is that if you have 240V you feed it into X1-1 and X1-3, but if you have 120V you use X1-1 and X1-2.

As far as troubleshooting the clock circuit I'm not able to be of much help. I have no access to the schematic or the code at this time.

EDIT: Oops I lied - I DO have schematic & code access. Let me see if I can come up with any troubleshooting tips.

One question though: when you get the 3 dots lighting up, is it always the same 3 or is it random?

Here are a few thought...

You're able to access the clock via WiFi, right? If so that at least proves the Wemos is running.

Double check wiring from clock board to tube board. Looking at your pictures I think it's correct but I can't quite make out how Red and Brown are connected at the clock end.

Check the resistors around the MPSA-42 guide control transistors, specifically R8 - R11. Make sure you actually have the right values in the right places.

If you have a scope, what do the G1 and G2 signals look like, as read at the tube board, relative to GND (not to RTN)? I'd expect to see a train of rectangular pulses that swing between ~110VDC and GND.

I haven't worked thru the what-ifs of having the tube in backwards initially so I'm not sure what damage, if any, that might have done.