There's something odd with the one in this listing: https://ebay.us/8EtaeL
Check the 5th picture (close up of the tubes from the top).
They don't look like MTH-90 since they seem to have a nipple on the top of 
the tube (the side facing the lenses).
Also, the bottom part (where the terminals are) is different from an MTH-90.
So this one seems to use a different type of thyratron but the question is, 
which one?

On Friday, April 16, 2021 at 8:48:38 PM UTC+2 Terry Bowman wrote:

>
> On Apr 16, 2021, at 1:36 PM, Keith Moore <nixie...@gmail.com> wrote:
>
> Did you get any more information on these? 
>
>
> I'm all ears as well.
>
> This seller just put up three BIN listings. They appear to be identical 
> (you may have to scroll down the page):
>
> https://www.ebay.com/str/robotube?_trksid=p2047675.l2563
>
>
> I wish now that I'd bought some of the ones with yellowed plastic. The 
> light probably shines through unlike the white ones that are opaque.
>
>
> Terry Bowman, KA4HJH
> "The Mac Doctor"
>
> "If only you could see what I've seen with your eyes."—Roy Batty, *Blade 
> Runner*
>
>

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