first post! I found this diode (a pair actually) at the bottom of a parts bin at a local surplus store. I was intrigued by the markings; I've never seen a white painted diode, or the "TN" (or TZ?) logo.

I've measured the forward voltage drop to be 0.31V with a peak atlas DCA55, so I'm assuming it's germanium.

Does anyone recognize this diode? Or the TN/TZ logo? Thanks!

enter image description here

  • \$\begingroup\$ What country is it likely from? Nikola Tesla? Probably not, but there was a Yugoslav diode maker called Tesla. \$\endgroup\$ – Spehro Pefhany Jun 29 '18 at 4:08
  • \$\begingroup\$ I'm not sure, the surplus store from which I purchased it was in northeast US. I actually have some Tesla transistors, I'll have to check that further. \$\endgroup\$ – Joe C. Jun 29 '18 at 4:26
  • \$\begingroup\$ Yep, I recognize him. It is Paul. He was acting up and got fired. Very low threshold to blow up when set under pressure \$\endgroup\$ – PlasmaHH Jun 29 '18 at 6:33
  • \$\begingroup\$ .31 could be schottky, I'd expect lower for germanium, but it looks old, or at-least odd. \$\endgroup\$ – Jasen Jun 29 '18 at 6:35
  • 1
    \$\begingroup\$ @Andyaka Answering your questions in order; not much, I really just want to know / Yes possibly, I build guitar pedals, and diodes like this are used frequently for signal clipping. / Not 100% trust, but it's better than my zero ideas now :) / Yes, as much as any other old part / Well as it turns out, I'm no electrical engineer. I was there looking for transistors in fact, saw these diodes and was intrigued. Simple as that :) \$\endgroup\$ – Joe C. Jun 29 '18 at 11:03

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