[R-390] Best R 390A Tube Tester

[Bob Camp]

Hi

The reality of a tube tester is actually worse than it looks at first. 
Often they are set up to do a measurement that is affected by the DC 
current through the tube. A tube with high DC leakage will pass the 
test on a tester set up this way ....

You can only do just so much with a simple tester ...

	Enjoy!

		Bob Camp
		KB8TQ


On Oct 26, 2004, at 1:26 PM, Doug Millar wrote:

>
> The best R 390A tube tester is a set of substitution tubes. Most tube 
> testers only measure tube performance at low frequencies and may not 
> give a good picture of what the tube is like. I am trying to find an 
> article written in the '50s that described the workings of most tube 
> testers and their limitations. The final suggestion was to use 
> substitution.
> 	Doug K6JEY
>
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