[AMPS] AL-80b PROBLEM - ANY IDEAS?

[measures]

>
>Just developed a problem in my AL-80B, and not sure what's going on.  When
>operating SSB or CW, all is well and has been since I got the amp last year.
>I'm getting back on RTTY and was running some tests with the new transceiver
>when I noticed this problem.
>
>I key the TS-950SDX in FSK mode with about 40 watts output, driving the
>AL-80B to about 400 watts out on 14.080 into a dummy load.  If I unkey the
>transceiver within a few seconds, everything returns to normal in receive
>mode.  However, if I leave carrier on for 15 seconds or so and then return
>to receive, I hear the relay drop in the linear, but I still have 100ma. of
>plate current and a resulting orange glow on the plate.  Turning the XMT
>switch on the AL-80B to STBY makes no difference.  I have to turn off the
>linear in order to get things back to normal.   Perhaps a failure in the
>AL-80B bias circuit?  

*  perhaps the bias relay is sticking?  To find out, measure the fil. CT 
to gnd V.

good luck, Floyd.  

-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end


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