Infamous D180 is it good or bad.


Eric
 

I have a Tek 284 that I am working on what is mostly working there is just some issues with the pulser output of course. I finally worked up the nerve tonight to test the Diode it has been on the shelf for a while. I knew these didoes were fragile and are very expensive to replace. I found them… for $250.00 each diode. So the way I have things set up, a curve tracer set to DC and very sensitive measurements. I have the collector going out to a Keithly 6500 to watch the current. As I turn up the collector I get current flow in to the diode. At about 9mA there is a LARGE increase in current. But NOT a short. If I dial down the collector it looks like the diode recovers. RIGHT about 9 mA I can get it to flutter between the 2 current readings. So if I am reading the instruments correctly is this tunnel diode good? I am thinking it is but I am very new to tunnel diodes. I know I am in the deep end of the pool with this one but confirming the diode would be great news to getting this 284 up and running. I can put up a short video if it will make more scene

Eric

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