[Milsurplus] 71A tube

[Bob Camp]

Hi

They used it for the same reason you see them used as an AM detector.  
They are a more sensitive small signal diode than most anything else  
you can get.

Bob
KB8TQ



On Oct 1, 2007, at 10:41 AM, Ray Fantini wrote:

> I am in the process of restoring a Weston OQ-2 tube tester. The  
> question I have is why did they use a 71A tube, a triode as a  
> rectifier for obtaining DC voltage for the short test? What  
> advantage is their to using a triode with the grid connected to the  
> plate as a diode? Not to mention that the plate current capability  
> of that tube is only about 10 Ma. So why did they do this? Was  
> thinking of replacing the defective tube with a diode and a current  
> limiting resistor installed in an old tube socket but wanted to  
> know why they did this in the first place.
> Ray Fantini KA3EKH
>
>
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