[Milsurplus] 2X2 question

[Mike Hanz]

You have a 290 volt VR toob.  Prolly a VR-290.  It's just mislabeled as 
a 2X2...  :-D

Jack Antonio wrote:

> After a disassembly/re-assembly trying to troubleshoot
> the IF, when I fired it up, the 2X2 glowed bright blue and
> the line fuse instantly blew.
>
> I pulled the tube and put a variable DC supply across the
> tube, reverse biased, and the tube breaks down at about 290 volts,
> at that voltage it has a nice blue glow inside, the higher the voltage,
> the more intense the glow.