[Amps] Bad tubes from Ebay

[Angel Vilaseca]

How can a gassy tube cause a flashover?

You would expect the electrons to collide with gas molecules within the 
tube, hence to decrease plate current.

But how can this possibly cause a short circuit between the plate and 
other electrodes?

Angel Vilaseca HB9SLV

Larry a écrit :

>Recent purchases of russian tubes from Ebay sellers have been pretty 
>disappointing with more than 50% DOA's. A summary of my experience is at:
>
> http://w7iuv.com/badtubes.html
>
>And yes, I did try to "condition" them first but it's hard to fix 
>mechanical shorts!
>
>As for me, I will no longer buy tubes from non-US sources.
>
>73, Larry
>
>  
>