Are you sure they are US made Dekatrons, I have a few of this model and 
they have all been equipped with Rodan Dekatrons made in Japan.

The most common failure in this counter is the high voltage electrolytics 
being poor, high ESR or dried out.

No manual unfortunately but it is a very simple design.

/Martin

On Thursday, 4 May 2023 at 23:45:37 UTC+2 Nick Andrews wrote:

> https://www.ebay.com/itm/234989555348
>
> I don't have a probe at the office, but the dekatrons come on and spin 
> around.  It's mesmerizing!  They stop when you hit reset, so that's good.  
> Looks like it has a built-in HV supply up to 1200V.  Also has a Jones 2x3 
> connector on back for something or other.  Pretty sweet to get 5 US-made 
> dekatrons that appear to work.
>
> Don't suppose anyone might have a manual for this?
>

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