[MRCA] 71A tube

[Rob Flory]

current limiting if there is a short?

RF

-----Original Message-----
>From: Ray Fantini <rafantini at salisbury.edu>
>Sent: Oct 1, 2007 10:41 AM
>To: milsurplus at mailman.qth.net, mrca at mailman.qth.net
>Subject: [MRCA] 71A tube
>
>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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