Hi Adam,
Was that, perhaps, K48 or K490? I don't see a K480 but I might be looking at a different version of the manual.
Glad you found/fixed it. Those relays are definitely a pain.
Barry - N4BUQ
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Well, after replacing C187 and C163 with no improvement, it turns out that I
overlooked relay K480. Swapping with my known good relay immediately got rid of
the giant hump at the front of the pulse, and the 7A13 rise time is ~3 ns after
a crude HF compensation adjustment.
I drilled the bad relay with a Dremel, added some contact cleaner and alcohol,
and exercised it for a while with a pulser and 14V incandescent lamp load. Now
it works too, and I feel like a dope.
thanks,
Adam
