Yeah, I know that swapping G1, and G2 is how you change directions. Both tubes 
won’t spin counter clockwise maybe cathode poisoning is the problem. It sticks 
on a cathode after making a few revolutions. What would you swap on the 
schematic to run a GS10D? 

Sent from my iPhone

> On May 18, 2019, at 09:09, Jon <[email protected]> wrote:
> 
> 
> Altering C5 (within wide limits) will not change whether it works or not on 
> your GS10D - it just determines the speed of pulses from the neon relaxation 
> oscillator. To make the dekatrons run anti-clockwise rather than clockwise, 
> simply swap the G1 and G2 connections. I don't see why you couldn't add in a 
> DPDT switch to make the stepping direction easily user-selectable.
> 
> Jon.
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