[Milsurplus] TV-2/BU tube checker problems...

[Kenneth G. Gordon]

> In a message dated 1/19/04 3:49:19 PM, keng@moscow.com writes:
> 
> 
> > 1) The last time I tried to check some 0B2 and 0A2 VR tubes 
> > with it, the VR tubes kept flashing and drawing more current 
> > than they should for a bit, even at the low current rating of 5 
> > mA. If I let them get good and hot, they would sometimes settle 
> > down. HOWEVER,
> > 
> > 2) After checking several of them, BOTH 3 amp fuses blew.
> > 
> 
> Ken,
> 
> Never tried to check a VR tube on a tube tester.   Don't recall ever having one
> fail (unless I did something like dropping it on a cement floor).   You got me
> curious, though, so I went down and turned on my TV-2C/U.   Only VR tube handy
> was an 0C3 (VR-105) which checked out from cold just like the chart said with no
> flashing, sputtering or fuse blowing.   
> 
> Would seem your TV-2 is pushing way too much current through the tubes under
> test for some reason.   Took a quick look at the schematic but WOW, tough
> tracing anything through that maze of wiring and switches...
> 
> Dennis D.   W7QHO
> Glendale, CA

Boy! You're telling me, Dennis!

One thing that really puzzles me is that when I checked 0B2s made by GE, 
the tester and the tubes performed perfectly. I don't get it at this point, but 
will probably figure it out...

Thanks,

Ken W7EKB