>
>Well, we seem to be headed toward some kind of cyclical peak where
>everybody's final blows up. Mine did tonite.
>
>My TL-922A has been working great up until this evening. I've had it on 75m
>SSB every night, with approx 200 grid and 600 plate mils before switching
>the amp and xctr to SSB.
>
>When I pushed the mike button to go on the air tonite, I got an arc from
>something over on the right rear quadrant, about halfway down (I was able to
>get this from a reflection of the arc in a window glass next to the right
>side of the final. The reflection was coming through the louvers on the
>side panel of the TL-922A.). The meters didn't go absolutely bonkers, but
>were jittery while the arcing was goiing on. The arc was established when I
>keyed the mike, and would stop when I let up on the mike button.
>
>I have an impression that maybe the arc is at the keying relay. Are these a
>known problem for arcing for no apparent reason? Whatever happened was
>without apparent cause. Everything else seemed normal.
>
>If it may have been the relay, what is the most common cause, and what is
>the cure?
>
>I will pull the unit down and trouble shoot it tomorrow. Just wanted some
>ballpark guesses as to what to look for.
>
"Circuit Improvements for the TL-922 Amplifier". the article is on my
Web site.
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