On Mar 30, 2024, at 20:30 , n4buq via groups.io <n4buq@...> wrote:
A couple of years ago, I had triggering issues with my 7B70. It turned out to be a bad tunnel diode (VR304). At that time, I was finding suitable tunnel diode replacements on eBay (1S2199); however, I'm not seeing those at the moment. Hopefully yours will turn out to be something else but, if not, then the 1S2199 diodes may resurface.
VR304 is the one I was wondering about, so I figured I may as well test it on my new 7CT1N. It looked okay on the curve tracer, and since it's socketed I swapped it in to my working 7B70. The good 7B70 continued to work fine, so I guess I can cross that TD off the list for now.
Maybe I can pull a side panel off the 7704A and probe the trigger board through the side.
thanks,
Adam
