Glad it isn't the TD. Yes, I've pulled side panel to get to the right-hand side of the time-bases. Getting to the left-hand side is a bit more of a challenge.
Did you also look at the other TD?
Barry - N4BUQ
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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
