Spark arrestors?

[martin martin]

All, 

During an e-waste clean up, I found this board inside an older Toshiba phone system.

The only ID I could see is D355, D425 and 152M.

The board designation is AR400, 500, 600.

Possible neon surge arrestors?

[Audrey]

Hi, I found this listing online, definitely a spark arrestor.

https://a.aliexpress.com/_mNkJM9O

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[Mac Doktor]

On Jun 24, 2023, at 7:17 PM, Audrey <tntm...@gmail.com> wrote:

Hi, I found this listing online, definitely a spark arrestor.

https://a.aliexpress.com/_mNkJM9O

Is the cylinder in the middle an insulator? That would make sense.

I really like the bigger ones. They contain Tritium.

Terry Bowman, KA4HJH
"The Mac Doctor"

https://www.astarcloseup.com

“...the book said something astonishing, a very big thought. The stars, it said, were suns but very far away. The Sun was a star but close up.”—Carl Sagan, "The Backbone Of Night", Cosmos, 1980

[Nick Andrews]

Interesting.   Bigger ones used in what?  I have a box somewhere with old railroad lightning assessors.  

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[Mac Doktor]

On Jun 25, 2023, at 12:21 AM, Nick Andrews <nickja...@gmail.com> wrote:

Interesting.   Bigger ones used in what?  I have a box somewhere with old railroad lightning assessors.  

I was looking at these: https://www.aliexpress.us/item/3256804108987619.html

Terry Bowman, KA4HJH
"The Mac Doctor"

https://www.astarcloseup.com

"Every kid starts out as a natural-born scientist, and then we beat it out of them. A few trickle through the system with their wonder and enthusiasm for science intact."—Carl Sagan, Psychology Today, 1996

[Nick Andrews]

Ooh, barely $108 each!

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[Nick Andrews]

Am I reading that right, <5.5MBq in each tube?  I have a couple of old spark gap tubes with Cs-137 in them used to calibrate isotope identifiers I have but being WWII vintage, likely not a uniform amount in each tube was used.  A pint spot on inside of the glass, but gas is likely easier to fill more uniformly piece to piece.

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[Robert G. Schaffrath]

When I saw this subject I was thinking of the Visoglow Neon Lightning Arrester that I bought NIB from Fair Radio Sales over 40 years ago. Never used it and only bought it for the novelty of a three terminal neon bulb in it. Found a picture of it online at https://www.picclickimg.com/DGgAAOSwC2ZkNzwb/RARE-Vtg-Neon-Gas-Radio-Lightning-Arrestor-Brach.webp.