More SB-200 issues

[Kenneth G. Gordon]

On 4 Jul 2009 at 13:44, Michael Hardie wrote:

> Ken,
> 
> Is it possible the fils aren't really in the vertical plane - that the
> socket or sockets are not corectly orientated?

Well, Mike, they are about as vertical as they can be. They 
are really easy to see too.

BTW, I suppose I should make some things clearer:

First of all, the new Shuguang tube that shorted its filament 
to the grid was not properly made, in my opinion. 

The filament "press" was very slightly off center and thus 
one side of the filament was a bit closer to the grid than the 
other side.

I put that down to a "quality control" issue, not to 
construction issue.

Comparing the Shuguang tubes to the Cetrons I have, or 
even to the single Penta-Labs tube I have, makes it very 
clear that the Shuguang tubes are constructed properly and 
of very high quality materials. 

The plates are large, thick, rugged, and accurately made 
and nicely finished.

The grids are made using the proper sized and kind of wire, 
are very finely and accurately wound, and appear to be at 
least the equal of the Cetrons.

The filaments appear visually to be every bit as good as 
those in the Cetrons I have fired up. The color appears 
identical too.

The glass appears to be hard, properly and accurately 
made, and of sufficient size.

At this point, I have no problem with their construction...only 
with their quality control.

Ken W7EKB

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