[AMPS] AL-1500 Goes Bang!

[km1h@juno.com]

On Fri, 27 Nov 1998 23:52:47 EST K4ab@aol.com writes:
>
>Right in the middle of the CQWW contest my AL-1500 goes bang.
>
>Thinking that I might have lost a tube, I disconnected the anode 
>connector and
>turned the amp back on.
>
>After the warm-up period, the HV goes to the normal level, stays that 
>way for
>a couple of seconds, then returns to zero.
>
>There are no signs of any charred components.
>
>Any guess what's wrong?
>
>73,
>Larry K4AB

Contest Gremlins are out in force this weekend. 

Check the fuses and holders.
Check the 1N40007 safety diode on the HV filter board
Also possible a metering resistor opened up.
Check the bias Zeners before trying to fire up.

Also possible you had a failure on the timer/overload board but I would
start with the above . 
BE CAREFUL!

73  Carl  KM1H

>
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