Yes, the ones I have also use an M22K (220K) resistor.
The tubes in mine aren't labeled at all but they're the more common MTH-90
tube without a nipple on top and the unit has clear lenses.
They come without any screws to attach the top cover to the lower part of
the case so it seems they're
I did a quick search and these these things are for sale on Etsy and various
other merchant sites I've never heard of. Similar pricing but eBay does give
you something resembling a safety net.
White plastic with red lenses seems to be the norm.
> On Apr 17, 2021, at 5:49 AM, Dekatron42
They are the same thryratron electrically but they have a different top,
some come with this evacuation pip at the front and some come with a lens
at the front and the evacuation pip at the bottom where the pins exit the
glass.
/Martin
On Saturday, 17 April 2021 at 17:34:17 UTC+2
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)
I had one of these many years ago and if I remember correctly now it is a
resistor of some 100k, or perhaps it was closer to 1Meg, as it just limits
the current flowing in the trigger circuit. You can google these and find
circuits like the ones below:
