[R-390] Radiation VR tubes

[Chris]

Thorium on the cathode at the least, but all sorts of nasty stuff can be found in different tubes-  Radium included.  

There are several possibilities listed here-
http://www.orau.org/ptp/collection/consumer%20products/electrontubes.htm

Regards,
Chris 

Sent from my outdated iPhone wireless thingy

On Jan 16, 2014, at 5:26 AM, Steve Hobensack <stevehobensack at hotmail.com> wrote:

> I knew this person that purchased a sleeve of VR tubes at a hamfest. Some of the tubes were 
> 
> marked with the radiation symbol. Apparently the radioactivity was to lower the strike voltage.
> 
> What is the radioactive element inside?
> 
> Steve N8YE
>                         
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