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zigzagflux 24th April 2007 01:13 AM

Tube testing questions
I just received a batch of the following:

OB3 (VR-90) regulator
6N6P double triode

I have a Precision 10-60 tester, but use it all too rarely. Just interested in verifying my purchase was good, but don't have any of the nomenclature in the reference book.

Are there any industry standard types to use, in order to test these?

Also, would I need to come up with a custom jig in order to check balance between the two halves of the 6N6P?


SY 24th April 2007 04:03 AM

A jig is trivial, a tube socket and a few cheap parts to make a simple grounded cathode amp, an oscilloscope, and a signal source (generator or sound card). If it passes signal, a few DC voltage checks will let you see if it's acting much like the curves predict.

For the VR tube, just rig up a power supply with a greater voltage than the tube's rating, then add a series resistor to bring the current to where you want to operate it, and make sure it lights up and that the voltage is right.

zigzagflux 24th April 2007 11:46 AM

No problem.

Is the tube tester of little value?

SY 24th April 2007 11:52 AM

For me, there's very little value in them unless I were to need to test all sorts of different tubes quickly (like a TV repairman would have done). Given more typical use for audio diyers (good vs, bad and matching of one particular type at a time), I think you can get better info from just setting up a test circuit.

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