TubeTesting Question

[Bill Coleman]

On Mar 1, 2006, at 3:22 PM, James Cundiff wrote:

>  I have a TC-3 tester. I am testing an OA2 tube. The tester has the  
> large red-yellow-green scale numbered 1-100. I believe 60 is the  
> minimal green passing score. The OA2 tube listing on the roll chart  
> says a good tube tests at 10. My question is, even though the  
> needle on the tester is buried in the red bad range, Is the tube  
> good if it tests at 10 or better? My tubes test at 10,16 and 25.  
> Your help to clear up my confusion would be greatly appreciated.

0A2 is an unusual tube. (That's Zero-A-Two) It is a gas-filled tube  
with two elements and no heater. It is designed to break down at one  
specific voltage (150v?). The operation is similar to a zener.

It has no gain, so if the manual says 10 is a passing score, believe it.

Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr at arrl.net
Quote: "Not within a thousand years will man ever fly!"
             -- Wilbur Wright, 1901

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