More SB-200 issues

[Kenneth G. Gordon]

On 3 Jul 2009 at 23:52, Kevin Ward wrote:

> This sounds like a problem we used to have (WBW) with Russian 811A's.
> You had to operate them either in a vertical position, base down, or
> horizontally with the filament in the vertical plane.  Otherwise the
> filament would sag and  -ZAP-  you needed a new tube.  Was there any
> precautionary note in the packaging of those Chinese tubes?

No.

And, I repeat, one of my "new", U.S. made, Cetrons did the 
same thing. In fact, it WAS the best one I had.

The tubes are mounted just like Heathkit, and several other 
manufacturers mount them: sideways with the filaments in 
the vertical plane.

Ken Gordon W7EKB

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